フルテキストURL PhysRevB_95_085109.pdf
著者 Wakita, Takanori| Terashima, Kensei| Hamada, Takahiro| Fujiwara, Hirokazu| Minohara, Makoto| Kobayashi, Masaki| Horiba, Koji| Kumigashira, Hiroshi| Kutluk, Galif| Nagao, Masanori| Watauchi, Satoshi| Tanaka, Isao| Demura, Satoshi| Okazaki, Hiroyuki| Takano, Yoshihiko| Mizuguchi, Yoshikazu| Miura, Osuke| Okada, Kozo| Muraoka, Yuji| Yokoya, Takayoshi|
抄録 We use soft x-ray photoemission spectroscopy (SXPES) to investigate Ce 4f electronic states of a new BiS2 layered superconductor CeO1-xFxBiS2, for polycrystalline and single-crystal samples. The Ce 3d spectrum of the single crystal of nominal composition x = 0.7 has no f(0) component and the spectral shape closely resembles the ones observed for Ce trivalent insulating compounds, strongly implying that the CeO layer is still in an insulating state even after the F doping. The Ce 3d-4f resonant SXPES for both polycrystalline and single-crystal samples shows that the prominent peak is located around 1 eV below the Fermi level (E-F) with negligible spectral intensity at EF. The F-concentration dependence of the valence band spectra for single crystals shows the increases of the degeneracy in energy levels and of the interaction between Ce 4f and S 3p states. These results give insight into the nature of the CeO1-xFx layer and the microscopic coexistence of magnetism and superconductivity in CeO1-xFxBiS2.
備考 This is an article published by American Physical Society
発行日 2017-02
出版物タイトル Physical Review B
95巻
8号
出版者 American Physical Society
開始ページ 085109
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.95.085109
Web of Sience KeyUT 000393501200003
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.95.085109
著者 Matsumoto, Masakazu| Yagasaki, Takuma| Tanaka, Hideki|
発行日 2015-11-06
出版物タイトル Physical Review Letters
115巻
19号
資料タイプ 学術雑誌論文
フルテキストURL PhysRevB_93_140505.pdf
著者 Kudo, Kazutaka| Ishii, Hiroyuki| Nohara, Minoru|
抄録 The physical properties and structural evolution of the MX2-type solid solution Au1-xPdxTe2 are reported. The end member AuTe2 is a normal metal with a monoclinic distorted CdI2-type structure with preformed Te-Te dimers. A monoclinic-trigonal structural phase transition at a finite temperature occurs upon Pd substitution and is suppressed to zero temperature near x = 0.55, and a superconducting phase with a maximum T-c = 4.65 K emerges. A clear indication of strong-coupling superconductivity is observed near the composition of the structural instability. The competitive relationship between Te-Te dimers and superconductivity is proposed.
備考 This is an article published by American Physical Society
発行日 2016-04
出版物タイトル Physical Review B
93巻
14号
出版者 American Physical Society
開始ページ 140505
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.93.140505
Web of Sience KeyUT 000374943900003
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.93.140505
フルテキストURL PhysRevB_93_104508.pdf
著者 Zheng, Lu| Miao, Xiao| Sakai, Yusuke| Goto, Hidenori| Uesugi, Eri| Eguchi, Ritsuko| Nishiyama, Saki| Sugimoto, Kunihisa| Fujiwara, Akihiko| Kubozono, Yoshihiro|
抄録 The superconducting transition temperature T-c of ammoniated metal-doped FeSe (NH3)(y)MxFeSe (M: metal atom) has been scaled with the FeSe plane spacing, and it has been suggested that the FeSe plane spacing depends on the location of metal atoms in (NH3)(y)MxFeSe crystals. Although the crystal structure of (NH3)(y)LixFeSe exhibiting a high T-c (similar to 44 K) was determined from neutron diffraction, the structure of (NH3)(y)MxFeSe exhibiting a low T-c (similar to 32 K) has not been determined thus far. Here, we determined the crystal structure of (NH3)(y)Cs0.4FeSe (T-c = 33 K) through the Rietveld refinement of the x-ray diffraction (XRD) pattern measured with synchrotron radiation at 30 K. The XRD pattern was analyzed based on two different models, on-center and off-center, under a space group of 14/mmm. In the on-center structure, the Cs occupies the 2a site and the N of NH3 may occupy either the 4c or 2b site, or both. In the off-center structure, the Cs may occupy either the 4c or 2b site, or both, while the N occupies the 2a site. Only an on-center structure model in which the Cs occupies the 2a and the N of NH3 occupies the 4c site provided reasonable results in the Rietveld analysis. Consequently, we concluded that (NH3)(y)Cs0.4FeSe can be assigned to the on-center structure, which produces a smaller FeSe plane spacing leading to the lower T-c.
備考 This is an article published by American Physical Society
発行日 2016-03
出版物タイトル Physical Review B
93巻
10号
出版者 American Physical Society
開始ページ 104508
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.93.104508
Web of Sience KeyUT 000371732500002
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.93.104508
フルテキストURL PhysRevA_86_013812.pdf
著者 Yoshimura, Motohiko| Sasao, N.| Tanaka, M.|
抄録 We develop for dipole-forbidden transition a dynamical theory of two-photon paired superradiance (PSR). This is a cooperative process characterized by two photons emitted back to back with equal energies. By irradiating the trigger laser from two target ends, with its frequency tuned at the half energy between two levels, a macroscopically coherent state of medium and fields dynamically emerges as time evolves, and a large signal of amplified output occurs with a time delay. The basic semiclassical equations in 1 + 1 space-time dimensions are derived for the field-plus-medium system to describe the space-time evolution of the entire system and are numerically solved to demonstrate the existence of both explosive and weak PSR phenomena in the presence of relaxation terms. The explosive PSR event terminates accompanying a sudden release of most of the energy stored in the target. Our numerical simulations are performed using the vibrational transition X-1 Sigma(+)(g)upsilon = 1 -> 0 of a para-H-2 molecule and taking many different excited atom number densities and different initial coherences between the metastable and the ground states. In an example with a number density close to O(10(21) cm(-3)) and a high initial coherence, the explosive event terminates several nanoseconds after the trigger irradiation, when the phase relaxation time larger than O(10 ns) is taken. After PSR events the system is expected to follow a steady-state solution which is obtained by analytic means and is made of many objects of field condensates endowed with a topological stability.
備考 This is an article published by American Physical Society
発行日 2012-07
出版物タイトル Physical Review A
86巻
1号
出版者 American Physical Society
開始ページ 013812
ISSN 1050-2947
NCID AA10764867
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevA.86.013812
Web of Sience KeyUT 000306188200009
関連URL isVersionOf https://doi.org/10.1103/PhysRevA.86.013812
フルテキストURL PhysRevB_97_104511.pdf
著者 Kobayashi, Kaya| Ai, Yukio| Jeschke, Harald O.| Akimitsu, Jun|
抄録 We investigate superconductivity in In1-xSnxTe (x <= 0.5) synthesized at high pressures of up to 2 GPa and observe an enhancement of the superconducting transition temperature T-c for increasing tin concentration x. These compounds have not been accessible in rocksalt structure via conventional ambient pressure synthesis. While the lattice constant smoothly increases with x, T-c saturates around x = 0.4. Electronic structure calculations indicate that the Tc modulation is brought on by the change of the density of states in the vicinity of the Fermi energy [N(E-F)]. However, differences between the calculated N(E-F) and the observed electronic specific-heat coefficient indicate that the phonon dispersion plays an important role in the system and that the mechanism of superconductivity may not be the same in the entire doping range.
備考 This is an article published by American Physical Society
発行日 2018-03-26
出版物タイトル Physical Review B
97巻
出版者 American Physical Society
開始ページ 104511
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン publisher
DOI 10.1103/PhysRevB.97.104511
Web of Sience KeyUT 000428238600008
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.97.104511
フルテキストURL PhysRevB_96_041106.pdf
著者 Terashima, Kensei| Sunagawa, M.| Fujiwara, H.| Fukura, T.| Fujii, M.| Okada, K.| Horigane, K.| Kobayashi, K.| Horie, R.| Akimitsu, J.| Golias, E.| Marchenko, D.| Varykhalov, A.| Saini, N. L.| Wakita, T.| Muraoka, Y.| Yokoya, T.|
抄録 The electronic structure of the lightly electron-doped correlated spin-orbit insulator Sr2IrO4 has been studied by angle-resolved photoelectron spectroscopy. We have observed the coexistence of a lower Hubbard band and an in-gap band; the momentum dependence of the latter traces that of the band calculations without on-site Coulomb repulsion. The in-gap state remained anisotropically gapped in all observed momentum areas, forming a remnant Fermi-surface state, evolving towards the Fermi energy by carrier doping. These experimental results show a striking similarity with those observed in deeply underdoped cuprates, suggesting the common nature of the nodal liquid states observed in both compounds.
備考 This is an article published by American Physical Society
発行日 2017-07
出版物タイトル Physical Review B
96巻
4号
出版者 American Physical Society
開始ページ 041106
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.96.041106
Web of Sience KeyUT 000405027800001
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.96.041106
フルテキストURL PhysRevA_96_063827.pdf
著者 Hara, Hideaki| Miyamoto, Yuki| Hiraki, Takahiro| Masuda, Takahiko| Sasao, Noboru| Uetake, Satoshi| Yoshimi, Akihiro| Yoshimura, Koji| Yoshimura, Motohiko|
抄録 We investigate how the efficiency of coherently amplified two-photon emission depends on the frequency of one of the two emitted photons, namely the signal photon. This is done over the wavelength range of 5.048-10.21 mu m by using the vibrational transition of parahydrogen. The efficiency increases with the frequency of the signal photon. Considering experimental errors, our results are consistent with the theoretical prediction for the present experimental conditions. This study is an experimental demonstration of the frequency dependence of coherently amplified two-photon emission, and also presents its potential as a light source.
備考 This is an article published by American Physical Society
発行日 2017-12
出版物タイトル Physical Review A
96巻
6号
出版者 American Physical Society
開始ページ 063827
ISSN 2469-9926
NCID AA10764867
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevA.96.063827
Web of Sience KeyUT 000418297700009
関連URL isVersionOf https://doi.org/10.1103/PhysRevA.96.063827
フルテキストURL PhysRevB_96_094527.pdf
著者 Onari, Seiichiro| Kontani, Hiroshi|
抄録 The origin of the electronic nematicity and its remarkable material dependence are famous longstanding unsolved issues in Fe-based superconductors. To attack these issues, we focus on the in-plane anisotropy of the resistivity: In the nematic state in FeSe, the relationp(x) >p(y) holds, whereP(x)(y) is the resistivity along the longer (shorter) Fe-Fe axis. In contrast, the opposite anisotropy p(x) < p(y) is realized in other undoped Fe-based superconductors. Such nontrivial material dependence is naturally explained in terms of the strongly orbitaldependent inelastic quasiparticle scattering realized in the orbital-ordered state. The opposite anisotropy between FeSe (p(x) >p(y)) and other undoped compounds (P-x < P-y) reflects the difference in the number of hole pockets. We also explain the large in-plane anisotropy of the thermoelectric power in the nematic state.
備考 This is an article published by American Physical Society
発行日 2017-09-26
出版物タイトル Physical Review B
96巻
9号
出版者 American Physical Society
開始ページ 094527
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 ©2017 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.96.094527
Web of Sience KeyUT 000411768000002
関連URL isVersionOf http://doi.org/10.1103/PhysRevB.96.094527
フルテキストURL PhysRevB_97_134507.pdf
著者 Tanaka, Kenta K.| Ichioka, Masanori| Onari, Seiichiro|
抄録 Local NMR relaxation rates in the vortex state of chiral and helical p-wave superconductors are investigated by the quasiclassical Eilenberger theory. We calculate the spatial and resonance frequency dependences of the local NMR spin-lattice relaxation rate T-1(-1) and spin-spin relaxation rate T-2(-1). Depending on the relation between the NMR relaxation direction and the d-vector symmetry, the local T-1(-1) and T-2(-1) in the vortex core region show different behaviors. When the NMR relaxation direction is parallel to the d-vector component, the local NMR relaxation rate is anomalously suppressed by the negative coherence effect due to the spin dependence of the odd- frequency s-wave spin-triplet Cooper pairs. The difference between the local T-1(-1) and T-2(-1) in the site-selective NMR measurement is expected to be a method to examine the d-vector symmetry of candidate materials for spin-triplet superconductors.
備考 This is an article published by American Physical Society
発行日 2018-04-10
出版物タイトル Physical Review B
97巻
出版者 American Physical Society
開始ページ 134507
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン publisher
DOI 10.1103/PhysRevB.97.134507
Web of Sience KeyUT 000429524500002
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.97.134507
フルテキストURL PhysRevB_95_064512.pdf
著者 Ichioka, Masanori| Kogan, V. G.| Schmalian, J.|
抄録 A model of a clean two-band s-wave superconductor with cylindrical Fermi surfaces, different Fermi velocities v(1),(2), and a general 2x2 coupling matrix V-alpha beta is used to study the order parameter distribution in vortex lattices. The Eilenberger weak coupling formalism is used to calculate numerically the spatial distributions of the pairing amplitudes Delta(1) and Delta(2) of the two bands for vortices parallel to the Fermi cylinders. For generic values of the interband coupling V-12, it is shown that, independently of the couplings V-alpha beta, of the ratio v(1)/v(2), of the temperature, and the applied field, the length scales of spatial variation of Delta(1) and of Delta(2) are the same within the accuracy of our calculations. The only exception from this single length-scale behavior is found for V-12 << V-11, i.e., for nearly decoupled bands.
備考 This is an article published by American Physical Society
発行日 2017-02
出版物タイトル Physical Review B
95巻
6号
出版者 American Physical Society
開始ページ 064512
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 ©2017 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.95.064512
Web of Sience KeyUT 000394657300012
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.95.064512
フルテキストURL PhysRevB_97_064425.pdf
著者 Horigane, Kazumasa| Fujii, M.| Okabe, H.| Kobayashi, K.| Horie, R.| Ishii, H.| Liao, Y. F.| Kubozono, Y.| Koda, A.| Kadono, R.| Akimitsu, J.|
抄録 We report the crystal structure and physical properties of Sr2-xLaxIrO4 synthesized by mechanical alloying. The magnetic transition temperature T-N and electrical resistivity decreased with increasing La doping, consistent with previous studies involving single-crystalline samples. We also identified the relationship between T-N and tetragonal distortion (c/a) in this system. This result suggests that the magnetism of the Sr214 system is strongly correlated with its crystal structure. Zero-field muon spin rotation/relaxation studies revealed that short-range antiferromagnetic ordering is realized in Sr1.9La0.1IrO4; also, the spin-glass state is stabilized in the low-temperature region. The Ir moment estimated from the longitudinal field mu SR results is 0.045 mu(B), ten times smaller than that of Sr2IrO4 (similar to 0.4 mu(B)), indicating that electrons are introduced into the Ir atoms.
備考 This is an article published by American Physical Society
発行日 2018-02-28
出版物タイトル Physical Review B
97巻
出版者 American Physical Society
開始ページ 064425
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン publisher
DOI 10.1103/PhysRevB.97.064425
Web of Sience KeyUT 000426321000005
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.97.064425
フルテキストURL PhysRevB_96_094522.pdf
著者 Nabeta, Masahiro| Tanaka, Kenta K.| Onari, Seiichiro| Ichioka, Masanori|
抄録 The roles of paramagnetic and diamagnetic pair-breaking effects in superconductivity in the electric-field-induced surface metallic state are studied using the Bogoliubov–de Gennes equation when magnetic fields are applied parallel to the surface. The multigap states of the subbands are related to the depth dependence and the magnetic field dependence of the superconductivity. In the Fermi-energy density of states and the spin density, subband contributions successively appear from higher-level subbands with increasing magnetic fields. The characteristic magnetic field dependence may be a key feature to identify the multigap structure of the surface superconductivity.
備考 This is an article published by American Physical Society
発行日 2017-09
出版物タイトル Physical Review B
96巻
9号
出版者 American Physical Society
開始ページ 094522
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 ©2017 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.96.094522
Web of Sience KeyUT 000411161700006
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.96.094522
フルテキストURL PhysRevB_96_014502.pdf
著者 Miao, Xiao| Terao, Takahiro| Yang, Xiaofan| Nishiyama, Saki| Miyazaki, Takafumi| Goto, Hidenori| Iwasa, Yoshihiro| Kubozono, Yoshihiro|
抄録 We have studied new superconductors prepared by metal doping of two-dimensional (2D) layered materials, FeSe and FeSe0.5Te0.5, using ethylenediamine (EDA). The superconducting transition temperatures (T(c)s) of metal-doped FeSe and metal-doped FeSe0.5Te0.5, i.e., (EDA)(y)MxFeSe and (EDA)(y)MxFeSe0.5Te0.5 (M: Li, Na, and K), were 31-45 K and 19-25 K, respectively. The stoichiometry of each sample was clarified by energy dispersive x-ray (EDX) spectroscopy, and the x-ray powder diffraction pattern indicated a large expansion of lattice constant c, indicating the cointercalation of metal atoms and EDA. The pressure dependence of superconductivity in (EDA)(y)NaxFeSe0.5Te0.5 has been investigated at a pressure of 0-0.8GPa, showing negative pressure dependence in the same manner as (NH3)(y)NaxFeSe0.5Te0.5. The T-c-c phase diagrams of MxFeSe and MxFeSe0.5Te0.5 were drawn afresh from the T-c and c of (EDA)(y)MxFeSe and (EDA)(y)MxFeSe0.5Te0.5, showing that the T-c increases with increasing c but that extreme expansion of c reverses the T-c trend.
備考 This is an article published by American Physical Society
発行日 2017-07
出版物タイトル Physical Review B
96巻
1号
出版者 American Physical Society
開始ページ 014502
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.96.014502
Web of Sience KeyUT 000405020200010
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.96.014502
フルテキストURL PhysRevB_97_094505.pdf
著者 Terao, Takahiro| Yang, Xiaofan| Miao, Xiao| Zheng, Lu| Goto, Hidenori| Miyazaki, Takafumi| Yamaoka, Hitoshi| Ishii, Hirofumi| Liao, Yen-Fa| Kubozono, Yoshihiro|
抄録 We prepared two superconducting phases, which are called “low-Tc phase” and “high-Tc phase” of (NH3)yNaxFeSe showing Tc’s of 35 and 44 K, respectively, at ambient pressure, and studied the superconducting behavior and structure of each phase under pressure. The Tc of the 35 K at ambient pressure rapidly decreases with increasing pressure up to 10 GPa, and it remains unchanged up to 22 GPa. Finally, superconductivity was not observed down to 1.4 K at 29 GPa, i.e., Tc < 1.4K. The Tc of the 44 K phase also shows a monotonic decrease up to 15 GPa and it weakly decreases up to 25 GPa. These behaviors suggest no pressure-driven high-Tc phase (called “SC-II”) between 0 and 25 GPa for the low-Tc and high-Tc phases of (NH3)yNaxFeSe, differing from the behavior of (NH3)yCsxFeSe,which has a pressure-driven high-Tc phase (SC-II) in addition to the superconducting phase (SC-I) observed at ambient and low pressures. The Tc-c phase diagram for both low-Tc and high-Tc phases shows that the Tc can be linearly scaled with c (or FeSe plane spacing), where c is a lattice constant. The reason why a pressure-driven high-Tc phase (SC-II) was found for neither low-Tc nor high-Tc phases of (NH3)yNaxFeSe is fully discussed, suggesting a critical c value as the key to forming the pressure-driven high-Tc phase (SC-II). Finally, the precise Tc-c phase diagram is depicted using the data obtained thus far from FeSe codoped with a metal and NH3 or amine, indicating two distinct Tc-c lines below c = 17.5A° .
キーワード Superconductors 2-dimensional systems 4-terminal techniques Pressure effects X-ray diffraction
備考 This is an article published by American Physical Society This study was partly supported by Grants-in-Aid (26105004 and 26400361) from MEXT, by JST ACT-C Grant No. JPMJCR12YW, Japan, and by the Program for Promoting the Enhancement of Research Universities.
発行日 2018-03-09
出版物タイトル Physical Review B
97巻
9号
出版者 American Physical Society
開始ページ 094505
ISSN 01631829
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン publisher
DOI 10.1103/PhysRevB.97.094505
Web of Sience KeyUT 000427010000003
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.97.094505
フルテキストURL PhysRevB_97_104503.pdf
著者 He, Tong| Yang, Xiaofan| Terao, Takahiro| Uchiyama, Takaki| Ueno, Teppei| Kobayashi, Kaya| Akimitsu, Jun| Miyazaki, Takafumi| Nishioka, Takumi| Kimura, Koji| Hayashi, Kouichi| Happo, Naohisa| Yamaoka, Hitoshi| Ishii, Hirofumi| Liao, Yen-Fa| Ota, Hiromi| Goto, Hidenori| Kubozono, Yoshihiro|
抄録 We investigated the pressure dependence of electric transport and crystal structure of Ag-doped Bi2Se3. In the sample prepared by Ag doping of Bi2Se3, the Bi atom was partially replaced by Ag, i.e., Ag0.05Bi1.95Se3. X-ray diffraction patterns of Ag0.05Bi1.95Se3 measured at 0–30 GPa showed three different structural phases, with rhombohedral, monoclinic, and tetragonal structures forming in turn as pressure increased, and structural phase transitions at 8.8 and 24 GPa. Ag0.05Bi1.95Se3 showed no superconductivity down to 2.0 K at 0 GPa, but under pressure, superconductivity suddenly appeared at 11 GPa. The magnetic field (H) dependence of the superconducting transition temperature Tc was measured at 11 and 20.5 GPa, in order to investigate whether the pressure-induced superconducting phase is explained by either p-wave polar model or s-wave model.
備考 This is an article published by American Physical Society This study was partly supported by Grants-in-Aid (Grants No. 26105004 and No. 17K05500) from MEXT, by JST ACT-C Grant No. JPMJCR12YW
発行日 2018-03-07
出版物タイトル Physical Review B
97巻
10号
出版者 American Physical Society
開始ページ 104503
ISSN 01631829
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン publisher
DOI 10.1103/PhysRevB.97.104503
Web of Sience KeyUT 000426776800003
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.97.104503
フルテキストURL PhysRevE_91_016302.pdf
著者 Yagasaki, Takuma| Matsumoto, Masakazu| Tanaka, Hideki|
抄録 Two different scenarios have been proposed on the phase separation occurring in the deeply supercooled liquid water. We discuss what we can derive from our simulation results for the two scenarios and propose a way for future investigation. We also demonstrate that the phase separation in the supercooled liquid water looks like the separation of liquid water and vapor just below the conventional critical point.
発行日 2015-01-23
出版物タイトル Physical review. E, Statistical, nonlinear, and soft matter physics
91巻
1号
出版者 American Physical Society
開始ページ 016302
ISSN 1539-3755
NCID AA11558033
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
論文のバージョン publisher
PubMed ID 25679745
DOI 10.1103/PhysRevE.91.016302
Web of Sience KeyUT 000349487700008
関連URL https://doi.org/10.1103/PhysRevE.91.016302
フルテキストURL PhysRevB_93_094507.pdf
著者 Tanaka, Kenta K.| Ichioka, Masanori| Onari, Seiichiro|
抄録 In order to identify the pairing symmetry with chirality, we study site-selective NMR in chiral p-wave superconductors. We calculate local nuclear relaxation rate T-1(-1) in the vortex lattice state by Eilenberger theory, including the applied magnetic field dependence. We find that T-1(-1) in the NMR resonance line shape is different between two chiral states p +/-(= p(x)+/- ip(y)), depending on whether the chirality is parallel or antiparallel to the vorticity. Anomalous suppression of T-1(-1) occurs around the vortex core in the chiral p(-) wave due to the negative coherence term coming from the odd-frequency s-wave Cooper pair induced around the vortex with Majorana state.
備考 This is an article published by American Physical Society
発行日 2016-03
出版物タイトル Physical Review B
93巻
9号
出版者 American Physical Society
開始ページ 094507
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.93.094507
Web of Sience KeyUT 000371727300005
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.93.094507
フルテキストURL PhysRevB_96_024414.pdf
著者 Inoue, Masashi| Ichioka, Masanori| Adachi, Hiroto|
抄録 Spin pumping refers to the microwave-driven spin current injection from a ferromagnet into the adjacent target material. We theoretically investigate the spin pumping into superconductors by fully taking account of impurity spin-orbit scattering that is indispensable to describe diffusive spin transport with finite spin diffusion length. We calculate temperature dependence of the spin pumping signal and show that a pronounced coherence peak appears immediately below the superconducting transition temperature Tc, which survives even in the presence of the spin-orbit scattering. The phenomenon provides us with a new way of studying the dynamic spin susceptibility in a superconducting thin film. This is contrasted with the nuclear magnetic resonance technique used to study a bulk superconductor.
備考 This is an article published by American Physical Society
発行日 2017-07
出版物タイトル Physical Review B
96巻
2号
出版者 American Physical Society
開始ページ 024414
ISSN 2469-9950
NCID AA11187113
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 American Physical Society
論文のバージョン publisher
DOI 10.1103/PhysRevB.96.024414
Web of Sience KeyUT 000405363500003
関連URL isVersionOf https://doi.org/10.1103/PhysRevB.96.024414
フルテキストURL PhysRevA_81_063623.pdf
著者 Huhtamaki, J. A. M.| Takahashi, M.| Simula, T. P.| Mizushima, T.| Machida, K.|
抄録 We have solved numerically the ground states of a Bose-Einstein condensate in the presence of dipolar interparticle forces using a semiclassical approach. Our motivation is to model, in particular, the spontaneous spin textures emerging in quantum gases with large dipole moments, such as Cr-52 or Dy condensates, or ultracold gases consisting of polar molecules. For a pancake-shaped harmonic ( optical) potential, we present the ground-state phase diagram spanned by the strength of the nonlinear coupling and dipolar interactions. In an elongated harmonic potential, we observe a helical spin texture. The textures calculated according to the semiclassical model in the absence of external polarizing fields are predominantly analogous to previously reported results for a ferromagnetic F = 1 spinor Bose-Einstein condensate, suggesting that the spin textures arising from the dipolar forces are largely independent of the value of the quantum number F or the origin of the dipolar interactions.
備考 This is an article published by American Physical Society
発行日 2010-06-14
出版物タイトル Physical Review A
81巻
6号
出版者 American Physical Society
開始ページ 063623
ISSN 24699926
NCID AA10764867
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン publisher
DOI 10.1103/PhysRevA.81.063623
Web of Sience KeyUT 000278719500005
関連URL isVersionOf https://doi.org/10.1103/PhysRevA.81.063623