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Penetration depth study in the heavy-fermion superconductor PrOs$$_4$$Sb$$_{12}$$

Shu, L.*; MacLaughlin, D. E.*; Heffner, R. H.; Callaghan, F. D.*; Sonier, J. E.*; Morris, G. D.*; Bernal, O. O.*; Bosse, A.*; Anderson, J. E.*; Yuhasz, W. M.*; Frederick, N. A.*; Maple, M. B.*

The penetration depth $$lambda$$ in the filled-skutterudite heavy-fermion superconductor PrOs$$_4$$Sb$$_{12}$$ has been measured using transverse-field muon spin rotation (TF-$$mu$$SR). It is found to be temperature-independent at low temperatures, consistent with a nonzero gap for point nodes in the gap. A $$sim$$10$$%$$ discrepancy is found at low temperatures. This may be due to mechanisms that modify the vortex-state field distribution, or to the surface scattering which breaks pairs in an odd-parity superconductor. Alternatively, it may be a matter of field orientation of nodal gap structure in the $$mu$$SR measurements.

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Category:Physics, Condensed Matter

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