start-ver=1.4
cd-journal=joma
no-vol=81
cd-vols=
no-issue=5
article-no=
start-page=053701-1
end-page=053701-4
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2012
dt-pub=20120406
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe2
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=IrTe2, a layered compound with a triangular iridium lattice, exhibits a structural phase transition at approximately 250 K. This transition is characterized by the formation of Ir-Ir bonds along the b-axis. We found that the breaking of Ir-Ir bonds that occurs in Ir1-xPtxTe2 results in the appearance of a structural critical point in the T = 0 limit at x(c) similar or equal to 0.035. Although both IrTe2 and PtTe2 are paramagnetic metals, superconductivity at T-c = 3.1 K is induced by the bond breaking in a narrow range of x >= x(c) in Ir1-xPtxTe2. This result indicates that structural fluctuations can be involved in the emergence of superconductivity.
en-copyright=
kn-copyright=
en-aut-name=PyonSunseng
en-aut-sei=Pyon
en-aut-mei=Sunseng
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=KudoKazutaka
en-aut-sei=Kudo
en-aut-mei=Kazutaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=NoharaMinoru
en-aut-sei=Nohara
en-aut-mei=Minoru
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
affil-num=1
en-affil=
kn-affil=Department of Physics, Faculty of Science, Okayama University
affil-num=2
en-affil=
kn-affil=Department of Physics, Faculty of Science, Okayama University
affil-num=3
en-affil=
kn-affil=Department of Physics, Faculty of Science, Okayama University
en-keyword=superconductivity
kn-keyword=superconductivity
en-keyword=IrTe2
kn-keyword=IrTe2
en-keyword=Pt doping
kn-keyword=Pt doping
en-keyword=triangular lattice
kn-keyword=triangular lattice
en-keyword=phase diagram
kn-keyword=phase diagram
en-keyword=structural phase transition
kn-keyword=structural phase transition
END
start-ver=1.4
cd-journal=joma
no-vol=152
cd-vols=
no-issue=8
article-no=
start-page=635
end-page=639
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2012
dt-pub=201204
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Iron–platinum–arsenide superconductors Ca10(PtnAs8)(Fe2−xPtxAs2)5
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=An overview of the crystal structures and physical properties of the recently discovered iron-platinum-arsenide superconductors, Ca-10(PtnAs8)(Fe2-xPtxAs2)(5) (n = 3 and 4), which have a superconducting transition temperature up to 38K, is provided. The crystal structure consists of superconducting Fe2As2 layers alternating with platinum-arsenic layers, PtnAs8. The upper critical field H-c2, hydrostatic pressure dependence of superconducting transition temperature T-c, and normal-state magnetic susceptibility are reported.
en-copyright=
kn-copyright=
en-aut-name=NoharaMinoru
en-aut-sei=Nohara
en-aut-mei=Minoru
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=KakiyaSatomi
en-aut-sei=Kakiya
en-aut-mei=Satomi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=KudoKazutaka
en-aut-sei=Kudo
en-aut-mei=Kazutaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=OshiroYoshihiro
en-aut-sei=Oshiro
en-aut-mei=Yoshihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=ArakiShingo
en-aut-sei=Araki
en-aut-mei=Shingo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=KobayashiTatsuo C.
en-aut-sei=Kobayashi
en-aut-mei=Tatsuo C.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=OkuKenta
en-aut-sei=Oku
en-aut-mei=Kenta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
en-aut-name=NishiboriEiji
en-aut-sei=Nishibori
en-aut-mei=Eiji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=
en-aut-name=SawaHiroshi
en-aut-sei=Sawa
en-aut-mei=Hiroshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=
affil-num=1
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=2
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=3
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=4
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=5
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=6
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=7
en-affil=
kn-affil=Department of Applied Physics, Nagoya University
affil-num=8
en-affil=
kn-affil=Department of Applied Physics, Nagoya University
affil-num=9
en-affil=
kn-affil=Department of Applied Physics, Nagoya University
en-keyword=A. Iron-based superconductors
kn-keyword=A. Iron-based superconductors
en-keyword=E. Transport
kn-keyword=E. Transport
en-keyword=E. High pressure
kn-keyword=E. High pressure
END
start-ver=1.4
cd-journal=joma
no-vol=100
cd-vols=
no-issue=25
article-no=
start-page=252104-1
end-page=252104-3
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2012
dt-pub=20120619
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Enhanced thermoelectric properties by Ir doping of PtSb2 with pyrite structure
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The effects of Ir doping on the thermoelectric properties of Pt1-xIrxSb2 (x = 0, 0.01, 0.03, and 0.1) with pyrite structure were studied. Measurements of electrical resistivity rho, Seebeck coefficient S, and thermal conductivity kappa were conducted. The results showed an abrupt change from semiconducting behavior without Ir (x = 0) to metallic behavior at x = 0.01. The sample with x = 0.01 exhibited large S and low rho, resulting in a maximum power factor (S-2/rho) of 43 mu W/cmK(2) at 400 K. The peculiar "pudding mold"-type electronic band dispersion could explain the enhanced thermoelectric properties in the metallic state.
en-copyright=
kn-copyright=
en-aut-name=NishikuboYoshihiro
en-aut-sei=Nishikubo
en-aut-mei=Yoshihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=NakanoSeiya
en-aut-sei=Nakano
en-aut-mei=Seiya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=KudoKazutaka
en-aut-sei=Kudo
en-aut-mei=Kazutaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=NoharaMinoru
en-aut-sei=Nohara
en-aut-mei=Minoru
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
affil-num=1
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=2
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=3
en-affil=
kn-affil=Department of Physics, Okayama University
affil-num=4
en-affil=
kn-affil=Department of Physics, Okayama University
END