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

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

2005-01-14

arxiv.org/abs/cond-mat/0501348v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1016/j.physb.2005.11.047

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 ($\mu$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 $\lambda(T)$ in the mixed state, respectively. We find no evidence for TRV, and show that the superfluid density, or alternatively, $\Delta\lambda(T) = \lambda(T) - \lambda(0)$, 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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