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Zero-field muon spin relaxation experiments have been carried out in thePr(Os_{1-x}Ru_x)_4Sb_12 and Pr_{1-y}La_yOs_4Sb_12 alloy systems to investigatebroken time-reversal symmetry (TRS) in the superconducting state, signaled bythe onset of a spontaneous static local magnetic field B_s. In both alloyseries B_s initially decreases linearly with solute concentration. Ru doping isconsiderably more efficient than La doping, with a ~50% faster initialdecrease. The data suggest that broken TRS is suppressed for Ru concentration x>~ 0.6, but persists for essentially all La concentrations. Our data support acrystal-field excitonic Cooper pairing mechanism for TRS-breakingsuperconductivity.

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