Time-reversal symmetry breaking superconductivity in (Pr,La)Pt4Ge12

ORAL

Abstract

Zero-field muon spin relaxation (µSR) measurements were carried out on the PrxLa1-xPt4Ge12 alloys, revealing a second-order like suppression of broken time reversal symmetry (TRS) on approaching x = 0. For x > 0.3 compounds, the onset temperatures of time-reversal violating phase is lower than the superconductivity (SC) transition temperatures. Both temperature dependence of upper critical field Hc2(T) and lower critical field Hc1(T) in x > 0.3 alloys have two different quadratic temperature regions. The SC order parameter of PrPt4Ge12 is then discussed in the context of TRS phase determined by µSR measurements, Hc2(T) and Hc1(T) results, and gap point nodes illustrated by our specific heat data (down to 0.1 K).

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Presenters

  • Jian Zhang

    State Key Laboratory of Surface Physics, Department of Physics, Fudan University

Authors

  • Jian Zhang

    State Key Laboratory of Surface Physics, Department of Physics, Fudan University

  • Z. F. Ding

    State Key Laboratory of Surface Physics, Department of Physics, Fudan University

  • Kevin Huang

    National High Magnetic Field Lab, Florida State University, NHMFL, Natl High Magnetic Field Lab, NHMFL at Florida State University, National HIgh Magnetic Field Lab at Florida State University, National High Magnetic Field Lab at Florida State University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University

  • Adrian Hillier

    ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus

  • Pabitra Biswas

    ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus

  • Cheng Tan

    State Key Laboratory of Surface Physics and Department of Physics, Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Physics, Fudan University

  • Lei Shu

    State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Fudan University, Department of Physics, Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Physics, Fudan University