start-ver=1.4
cd-journal=joma
no-vol=3
cd-vols=
no-issue=1
article-no=
start-page=148
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200827
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure T-c. (P)-dependent In-115 nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh0.5Ir0.5In5. These experiments reveal an antiferromagnetic (AF) QCP at P-c(AF) = 1.2 GPa where a dome of superconductivity reaches a maximum transition temperature Tc. Preceding P-c(AF), however, the NQR frequency nu(Q) undergoes an abrupt increase at P-c* = 0.8 GPa in the zero-temperature limit, indicating a change from localized to itinerant character of cerium's f-electron and associated small-to-large change in the Fermi surface. At P-c(AF) where T-c is optimized, there is an unusually large fraction of gapless excitations well below T-c that implicates spin-singlet, odd-frequency pairing symmetry.
en-copyright=
kn-copyright=

en-aut-name=KawasakiShinji
en-aut-sei=Kawasaki
en-aut-mei=Shinji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=OkaToshihide
en-aut-sei=Oka
en-aut-mei=Toshihide
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=SorimeAkira
en-aut-sei=Sorime
en-aut-mei=Akira
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=KogameYuji
en-aut-sei=Kogame
en-aut-mei=Yuji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=UemotoKazuhiro
en-aut-sei=Uemoto
en-aut-mei=Kazuhiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=MatanoKazuaki
en-aut-sei=Matano
en-aut-mei=Kazuaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=GuoJing
en-aut-sei=Guo
en-aut-mei=Jing
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=CaiShu
en-aut-sei=Cai
en-aut-mei=Shu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

en-aut-name=SunLiling
en-aut-sei=Sun
en-aut-mei=Liling
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=

en-aut-name=SarraoJohn L.
en-aut-sei=Sarrao
en-aut-mei=John L.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=

en-aut-name=ThompsonJoe D.
en-aut-sei=Thompson
en-aut-mei=Joe D.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=11
ORCID=

en-aut-name=ZhengGuo-Qing
en-aut-sei=Zheng
en-aut-mei=Guo-Qing
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=12
ORCID=

affil-num=1
en-affil=Department of Physics, Okayama University
kn-affil=

affil-num=2
en-affil=Department of Physics, Okayama University
kn-affil=

affil-num=3
en-affil=Department of Physics, Okayama University
kn-affil=

affil-num=4
en-affil=Department of Physics, Okayama University
kn-affil=

affil-num=5
en-affil=Department of Physics, Okayama University
kn-affil=

affil-num=6
en-affil=Department of Physics, Okayama University
kn-affil=

affil-num=7
en-affil=Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics
kn-affil=

affil-num=8
en-affil=Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics
kn-affil=

affil-num=9
en-affil=Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics
kn-affil=

affil-num=10
en-affil=Los Alamos National Laboratory
kn-affil=

affil-num=11
en-affil=Los Alamos National Laboratory
kn-affil=

affil-num=12
en-affil=Department of Physics, Okayama University
kn-affil=
en-keyword=Condensed-matter physics
kn-keyword=Condensed-matter physics
en-keyword=Phase transitions and critical phenomena
kn-keyword=Phase transitions and critical phenomena
en-keyword=Superconducting properties and materials
kn-keyword=Superconducting properties and materials
END