Superconductivity in the weakly correlated non-centrosymmetric compounds Th<i>T</i>Si (<i>T </i>= Co, Ni, Ir, Pt)

ORAL

Abstract

The discovery of unconventional superconductivity in a heavy-fermion antiferromagnet CePt3Si has ignited remarkable interest in studying non-centrosymmetric (NCS) superconductors. The lack of an inversion center in this crystal structure induces an intrinsic electric field gradient that gives rise to antisymmetric spin-orbit coupling. As a result the spin degeneracy of electronic bands is lifted, which may develop parity-mixed superconducting state. We present our study on the weakly correlated Th-based alloys ThTSi (T = Co, Ni, Ir, Pt), crystallizing with a NCS structure like LaPtSi (a superconductor at TC = 3.35 K). We discuss the variation of superconducting transitions with transition metals based on our experimental results as well as band calculations.

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Presenters

  • Shanta Saha

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland

Authors

  • Shanta Saha

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland

  • Limin Wang

    • CNAM, Department of Physics, Univ of Maryland-College Park
    • Univ of Maryland-College Park
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland
    • CNAM, Physics Department, University of Maryland

  • Johnpierre Paglione

    • Center for Nanophysics and Advanced Materials , University of Maryland
    • CNAM, Department of Physics, University of Maryland
    • Univ of Maryland-College Park
    • Department of Physics, University of Maryland
    • CNAM, Department of Physics, Univ of Maryland-College Park
    • Univ of Maryland - College Park
    • College Park, MD 20742-4111, Univ of Maryland-College Park
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland
    • Center for Nanophysics and Advanced Materials, University of Maryland
    • University of Maryland, College Park
    • University of Maryland