Multiband superconductivity in PrOs4Sb12: nodes or no nodes?

Lei Shu (University of California-Riverside)

Muon spin rotation (šSR) measurements have provided valuable information for the basic studies in condensed matter physics. It is a sensitive probe of internal magnetic fields and electronic configurations of materials. In this talk, transverse-field muon spin rotation experiments in the heavy-fermion superconductor PrOs4Sb12 (Tc = 1:85 K) will be discussed. The experiment suggest that the superconducting penetration depth ¸(T) is temperatureindependent at low temperatures, consistent with a gapped quasiparticle excitation spectrum. In contrast, radiofrequency measurements yield a stronger temperature dependence of ¸(T), indicative of point nodes in the gap. Such a discrepancy may be related to the multiband structure of PrOs4Sb12. In addition, muon Knight shift measurements suggest that the muon.s perturbing effect in modification of the Pr3+ crystalline electric field neighboring in PrOs4Sb12 is negligibly small

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