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Suppression of time reversal symmetry breaking superconductivity in Pr(Os,Ru)₄Sb₁2 and (Pr,La)Os₄Sb₁2

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arxiv 1102.1997 v1 pith:OC3D6MLQ submitted 2011-02-09 cond-mat.supr-con

Suppression of time reversal symmetry breaking superconductivity in Pr(Os,Ru)₄Sb₁2 and (Pr,La)Os₄Sb₁2

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

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