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Point contact Andreev reflection spectroscopy on possible chiral superconductor UTe<sub>2</sub>

POSTER

Abstract

Recent findings on a heavy-fermion superconductor, UTe2 such as 1) an exceptionally large and anisotropic upper critical field, 2) a large residual Sommerfeld coefficient, 3) the reentrant superconducting phase in a high magnetic field, and 4) pressure-enhanced superconductivity, have attracted great attention as indication of spin-triplet superconductivity. Scanning tunneling microscopy/spectroscopy measurements and microwave surface impedance measurement on UTe2 have suggested presence of the chiral edge state and normal fluid at the surface as evidence for the chiral spin-triplet pairing symmetry of the superconducting order parameter in UTe2. To further investigate the superconducting order parameter, we are performing point contact Andreev reflection (PCAR) measurements on single-crystal UTe2. PtIr and Nb tips are used to form N(I)/S and S(I)/S point-contact junctions, respectively. Evolution of conductance spectra as a function of temperature, magnetic field, and tip pressure will be discussed.

Presenters

  • Seunghun Lee

    University of Maryland, College Park

Authors

  • Seunghun Lee

    University of Maryland, College Park

  • Xiaohang Zhang

    University of Maryland, College Park

  • Sheng Ran

    NIST Center for Neutron Research, National Institute of Standards and Technology, University of Maryland, College Park, National Institute of Standards and Technology, Physics Department, University of Maryland, University of Maryland, University of Maryland, College Park & NIST, Department of Physics, University of Maryland, College Park, NIST Center for Neutron Research

  • Richard Greene

    University of Maryland, College Park

  • Nicholas Butch

    NIST Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards and Technology, Center of Neutron Research, National Institute of Standards and Technology, Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, NIST center for neutron research, NIST, NIST Center for Neutron Research, National Institute of Standards and Technology,, University of Maryland, College Park & NIST, National Institute of Standards and Technology Center for Neutron Research

  • Johnpierre Paglione

    University of Maryland, College Park, Physics Department, University of Maryland, Maryland Quantum Materials Center, Department of Physics, University of Maryland College Park, Department of Physics, University of Maryland, College Park, University of Maryland, College Park & NIST, Univ of Maryland-Colege Park, Center for Quantum Materials, University of Maryland, Maryland Quantum Materials Center, Department of Physics, University of Maryland-College Park,College Park, Maryland 20742

  • Ichiro Takeuchi

    University of Maryland, College Park