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The symmetry of the superconducting order parameter in PuCoGa$_5$

G. D Morris·R. H. Heffner·E. D. Bauer·L. A. Morales·J. S. Sarrao·M. J. Fluss·D. E. MacLaughlin·L. Shu·J. E. Anderson
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Abstract

The symmetry of the superconducting order parameter in single-crystalline PuCoGa$_5$ ($T_{\rm c} = 18.5$ K) is investigated via zero- and transverse- field muon spin relaxation ($μ$SR) measurements, probing the possible existence of orbital and/or spin moments (time reversal-symmetry violation TRV) associated with the superconducting phase and the in-plane magnetic-field penetration depth $λ(T)$ in the mixed state, respectively. We find no evidence for TRV, and show that the superfluid density, or alternatively, $Δλ(T) = λ(T) - λ(0)$, are $\propto T$ for $T/T_{\rm c} \leq 0.5$. Taken together these measurements are consistent with an even-parity (pseudo-spin singlet), d-wave pairing state.

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G. D Morris, R. H. Heffner, E. D. Bauer, L. A. Morales, J. S. Sarrao, M. J. Fluss, D. E. MacLaughlin, L. Shu, J. E. Anderson. 2005-01-14. The symmetry of the superconducting order parameter in PuCoGa$_5$. https://doi.org/10.1016/j.physb.2005.11.047

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