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Report No.

$$mu$$SR studies of the superconducting order parameter in PuCoGa$$_5$$

Morris, G. D.*; Heffner, R. H.; Bauer, E. D.*; Morales, L. A.*; Sarrao, J. L.*; Fluss, M. J.*; MacLaughlin, D. E.*; Shu, L.*; Anderson, J. E.*

We present transverse-field (TF) measurements of the in-plane magnetic-field penetration depth $$lambda (T)$$ in single-crystalline PuCoGa$$_5$$ for 0.06 T applied filed. We find that the temperature dependence of the superfluid density, and therefore $$Deltalambda (T)=lambda (T)-lambda (0)$$, is $$propto T$$ for $$T/T_c le 0.5$$. We estimate that the measured $$lambda (0)=241(3)$$ nm. Zero-field (ZF) measurements find no evidence for time-reversal symmetry violation. The ZF and TF measurements are consistent with an even-parity (pseudo-spin singlet), d-wave paring state.



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Category:Physics, Condensed Matter



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