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Suppression of time reversal symmetry breaking superconductivity in Pr(Os,Ru)_4Sb_12 and (Pr,La)Os_4Sb_12

Zero-field muon spin relaxation experiments have been carried out in the Pr(Os_{1-x}Ru_x)_4Sb_12 and Pr_{1-y}La_yOs_4Sb_12 alloy systems to investigate broken time-reversal symmetry (TRS) in the superconducting state, signaled by the onset of a spontaneous static local magnetic field B_s. In both alloy series B_s 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.

preprint2011arXivOpen access
Lei ShuW. HigemotoY. AokiA. D. HillierK. OhishiK. IshidaR. KadonoA. KodaO. O. BernalD. E. MacLaughlinY. TunashimaY. YonezawaS. SanadaD. KikuchiH. SatoH. SugawaraT. U. ItoM. B. Maple
cond-mat.supr-con
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Lei ShuW. HigemotoY. AokiA. D. HillierK. OhishiK. IshidaR. KadonoA. KodaO. O. BernalD. E. MacLaughlinY. TunashimaY. YonezawaS. SanadaD. KikuchiH. SatoH. SugawaraT. U. ItoM. B. Maple

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