Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12

Details Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12 Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12

2010-07-28

arxiv.org/abs/1007.4898v1

Physics

Condensed Matter

Superconductivity

To appear in Phys. Rev. B. 5 pages, 3 figures

Scientific paper

Zero and longitudinal field muon spin rotation (muSR) experiments were performed on the superconductors PrPt4Ge12 and LaPt4Ge12. In PrPt4Ge12 below Tc a spontaneous magnetization with a temperature variation resembling that of the superfluid density appears. This observation implies time-reversal symmetry (TRS) breaking in PrPt4Ge12 below Tc = 7.9 K. This remarkably high Tc for an anomalous superconductor and the weak and gradual change of Tc and of the related specific heat anomaly upon La substitution in La_(1-x)Pr_xPt_4Ge_(12) suggests that the TRS breaking is due to orbital degrees of freedom of the Cooper pairs.

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