Suppression of time-reversal symmetry breaking superconductivity in Pr(Os1−xRux)4Sb12 and Pr1−yLayOs4Sb12

Lei Shu; W. Higemoto; Y. Aoki; A. D. Hillier; K. Ohishi; K. Ishida; R. Kadono; A. Koda; O. O. Bernal; D. E. MacLaughlin; Y. Tunashima; Y. Yonezawa; S. Sanada; D. Kikuchi; H. Sato; H. Sugawara; T. U. Ito; M. B. Maple

doi:10.1103/PhysRevB.83.100504

Suppression of time-reversal symmetry breaking superconductivity in Pr(Os1−xRux)4Sb12 and Pr1−yLayOs4Sb12

Lei Shu, W. Higemoto, Y. Aoki, A. D. Hillier, K. Ohishi, K. Ishida, R. Kadono, A. Koda, O. O. Bernal, D. E. MacLaughlin, Y. Tunashima, Y. Yonezawa, S. Sanada, D. Kikuchi, H. Sato, H. Sugawara, T. U. Ito, M. B. Maple

DOI 10.1103/PhysRevB.83.100504 · Physical Review B

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Abstract

Zero-field muon spin relaxation experiments have been carried out in the Pr(Os1−xRux)4Sb12 and Pr1−yLayOs4Sb12 alloy systems to investigate broken time-reversal symmetry (TRS) in the superconducting state, signaled by the onset of a spontaneous static local magnetic field Bs. In both alloy series Bs initially decreases linearly with solute concentration. Ru doping is considerably more efficient than La doping, with a ~50% faster initial decrease. The data suggest that broken TRS is suppressed for Ru concentration x≳0.6 but persists for essentially all La concentrations. Our data support a crystal-field excitonic Cooper pairing mechanism for TRS-breaking superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.85	Pressure not reported	unknown
PrRu4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.1	Pressure not reported	unknown
LaOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.74	Pressure not reported	unknown
Pr(Os1-xRux)4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pr1-yLayOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown