TY - JOUR
T1 - Superconducting behavior of a new metal iridate compound, SrIr2, under pressure
AU - Yang, Xiaofan
AU - Li, Huan
AU - He, Tong
AU - Taguchi, Tomoya
AU - Wang, Yanan
AU - Goto, Hidenori
AU - Eguchi, Ritsuko
AU - Horie, Rie
AU - Horigane, Kazumasa
AU - Kobayashi, Kaya
AU - Akimitsu, Jun
AU - Ishii, Hirofumi
AU - Liao, Yen Fa
AU - Yamaoka, Hitoshi
AU - Kubozono, Yoshihiro
N1 - Publisher Copyright:
© 2019 IOP Publishing Ltd.
PY - 2020
Y1 - 2020
N2 - Herein, we investigated the pressure dependence of electric transport in a new type of superconducting metal iridate compound, SrIr2, that exhibits a superconducting transition temperature, T c, as high as 6.6 K at ambient pressure, in order to complete the T c-pressure (p ) phase diagram. Very recently, this sample's superconductivity was discovered by our group, but the superconducting behavior has not yet been clarified under pressure. In this study, we fully investigated this sample's superconductivity in a wide pressure range. The T c value decreased with an increase in pressure, but the onset superconducting transition temperature, (R-T plot), increased above a pressure of 8 GPa, indicating an unconventional superconductivity different from a BCS-type superconductor. The magnetic field dependence of electric resistance (R) against temperature (R-T plot) recorded at 7.94 and 11.3 GPa suggested an unconventional superconductivity, followed by a p -wave polar model, supporting the deviation from a simple s-wave pairing. Moreover, we fully investigated the pressure dependence of crystal structure in SrIr2 and discussed the correlation between superconductivity and crystal structure. This is the first systematic study on superconducting behavior of a new type of metal iridate compound, MIr2 (M: alkali-earth metal atom), under pressure.
AB - Herein, we investigated the pressure dependence of electric transport in a new type of superconducting metal iridate compound, SrIr2, that exhibits a superconducting transition temperature, T c, as high as 6.6 K at ambient pressure, in order to complete the T c-pressure (p ) phase diagram. Very recently, this sample's superconductivity was discovered by our group, but the superconducting behavior has not yet been clarified under pressure. In this study, we fully investigated this sample's superconductivity in a wide pressure range. The T c value decreased with an increase in pressure, but the onset superconducting transition temperature, (R-T plot), increased above a pressure of 8 GPa, indicating an unconventional superconductivity different from a BCS-type superconductor. The magnetic field dependence of electric resistance (R) against temperature (R-T plot) recorded at 7.94 and 11.3 GPa suggested an unconventional superconductivity, followed by a p -wave polar model, supporting the deviation from a simple s-wave pairing. Moreover, we fully investigated the pressure dependence of crystal structure in SrIr2 and discussed the correlation between superconductivity and crystal structure. This is the first systematic study on superconducting behavior of a new type of metal iridate compound, MIr2 (M: alkali-earth metal atom), under pressure.
KW - 5d tranistion metal atom
KW - iridate
KW - pressure
KW - spin orbit coupling
KW - superconductivity
KW - unconventional superconductor
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U2 - 10.1088/1361-648X/ab4605
DO - 10.1088/1361-648X/ab4605
M3 - Article
C2 - 31536973
AN - SCOPUS:85077496814
VL - 32
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 2
M1 - 025704
ER -