Spontaneously polarized half-gapped superconductivity in UTe2

ORAL

Abstract

We discovered novel nonunitary spin-triplet superconductivity in UTe2, with the highest Tc and Hc2 among all candidates. Superconducting state closely resembles that of ferromagnetic superconductors, but the normal state is paramagnetic and shows no indication of magnetic ordering. UTe2 exhibits an extremely large, anisotropic upper critical field Hc2, temperature independent NMR Knight shift in the superconducting state, and a large residual normal electronic density of states indicating that half of the electrons remain ungapped. All these results strongly indicate that the superconductivity in UTe2 is carried by nonunitary spin-triplet pairs. This discovery yields a new platform for encoding information using topological excitations and for manipulation of spin-polarized currents.

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Presenters

  • Sheng Ran

    University of California, San Diego, University of Maryland, College Park & NIST

Authors

  • Sheng Ran

    University of California, San Diego, University of Maryland, College Park & NIST

  • Chris Eckberg

    University of Maryland, College Park

  • Qing-Ping Ding

    Ames Laboratory, Iowa State University, Ames Laboratory, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Iowa State University & Ames Lab

  • Yuji Furukawa

    Ames Laboratory, Iowa State University, Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Iowa State University & Ames Lab, Ames Lab & Dept of Physics and Astronomy, Iowa State University, Iowa State University

  • Tristin E Metz

    University of Maryland, College Park, Department of Physics, University of Maryland, College Park

  • Shanta Saha

    Physics, University of Maryland, Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, University of Maryland, College Park & NIST, Department of Physics, University of Maryland, College Park, University of Maryland, University of Maryland - College Park

  • I-Lin Liu

    University of Maryland, College Park, Center for Nanoscale and Advanced Materials, University of Maryland, University of Maryland, College Park & NIST

  • Mark Zic

    University of Maryland, College Park

  • Johnpierre Paglione

    Physics, University of Maryland, University of Maryland, College Park, Center for Nanophysics and Advanced Materials, University of Maryland College Park, Center for Nanophysics and Advance Materials, University of Maryland, College Park, MD, University of Maryland, College Park & NIST, Department of Physics, University of Maryland, College Park, University of Maryland, University of Maryland - College Park

  • Nicholas Butch

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