Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12

A. Maisuradze; W. Schnelle; R. Khasanov; R. Gumeniuk; M. Nicklas; H. Rosner; A. Leithe-Jasper; Yu. Grin; A. Amato; P. Thalmeier

doi:10.1103/PhysRevB.82.024524

Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12

Superconductivity 2015-05-19 v1

Authors: A. Maisuradze , W. Schnelle , R. Khasanov , R. Gumeniuk , M. Nicklas , H. Rosner , A. Leithe-Jasper , Yu. Grin , A. Amato , P. Thalmeier

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Abstract

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.

Keywords

time-reversal symmetry breaking muon spin rotation superconductivity PrPt4Ge12 spontaneous magnetization Cooper pairs orbital degrees of freedom

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@article{arxiv.1007.4898,
  title  = {Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12},
  author = {A. Maisuradze and W. Schnelle and R. Khasanov and R. Gumeniuk and M. Nicklas and H. Rosner and A. Leithe-Jasper and Yu. Grin and A. Amato and P. Thalmeier},
  journal= {arXiv preprint arXiv:1007.4898},
  year   = {2015}
}

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

Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12

Abstract

Keywords

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