Superconductivity in pressurized CeRhGe3 and related noncentrosymmetric compounds

Honghong Wang; Jing Guo; Eric D. Bauer; Vladimir A. Sidorov; Hengcan Zhao; Jiahao Zhang; Yazhou Zhou; Zhe Wang; Shu Cai; Ke Yang; Aiguo Li; Xiaodong Li; Yanchun Li; Peijie Sun; Yi-feng Yang; Qi Wu; Tao Xiang; J. D. Thompson; Liling Sun

doi:10.1103/PhysRevB.97.064514

Superconductivity in pressurized CeRhGe3 and related noncentrosymmetric compounds

Honghong Wang, Jing Guo, Eric D. Bauer, Vladimir A. Sidorov, Hengcan Zhao, Jiahao Zhang, Yazhou Zhou, Zhe Wang, Shu Cai, Ke Yang, Aiguo Li, Xiaodong Li, Yanchun Li, Peijie Sun, Yi-feng Yang, Qi Wu, Tao Xiang, J. D. Thompson, Liling Sun

DOI 10.1103/PhysRevB.97.064514 · Physical Review B

T1

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Abstract

We report the discovery of superconductivity in pressurized CeRhGe3, a nonsuperconducting member of the isostructural family of noncentrosymmetric heavy-fermion compounds CeTX3(T=Co, Rh, Ir and X=Si, Ge). Superconductivity appears in CeRhGe3 at a pressure of 19.6 GPa and the transition temperature TC reaches a maximum value of 1.3 K at 21.5 GPa. This finding provides an opportunity to establish systematic correlations between superconductivity and material properties within this family. Though ambient-pressure unit-cell volumes and critical pressures for superconductivity vary substantially across the series, all family members reach a maximum TCmax at a common (±1.7%) critical cell volume Vcrit, and TCmax at Vcrit increases with increasing spin-orbit coupling strength of the d electrons. These correlations show that substantial Kondo and spin-orbit couplings favor superconductivity in this family, the latter reflecting the role of broken centrosymmetry.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeRhGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.1	19.6 GPa	onset
CeRhGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.3	21.5 GPa	onset
CeRhGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.2	20.1 GPa	onset
CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeRhSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeIrSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeCoGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeIrGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown