Anomalous normal fluid response in helical spin-triplet superconductor UTe2

ORAL

Abstract

We report evidence for a helical spin-triplet pairing state of UTe2 with significant surface normal fluid response. The microwave surface impedance of UTe2 crystals was measured and converted to complex conductivity. The anomalous residual normal fluid conductivity (real part) in the zero temperature limit supports the presence of a significant normal fluid response in the ground state. The superfluid conductivity (imaginary part) follows the low temperature behavior predicted for the helical spin-triplet state. The temperature dependence of the superfluid conductivity also reveals a low impurity scattering rate and low frequency-to-energy-gap ratio, implying that the observed normal fluid response is not due to an extrinsic origin. Candidate mechanisms such as a surface Majorana normal fluid, which are predicted for the helical spin-triplet superconductor, are discussed.
[Ref] arXiv:1909.09032

*This work is supported by NSF grant No. DMR - 1410712, DOE grants No. DE-SC 0017931, DE-SC 0018788, DE-SC-0019154, Gordon and Betty Moore Foundation's EPiQS Initiative through Grant GBMF4419.

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Presenters

  • Seokjin Bae

    • University of Maryland, College Park
    • Center for Quantum Materials, University of Maryland

Authors

  • Seokjin Bae

    • University of Maryland, College Park
    • Center for Quantum Materials, University of Maryland

  • Hyunsoo Kim

    • University of Maryland, College Park
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland-College Park,College Park, Maryland 20742

  • 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

  • Yun Suk Eo

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

  • I-Lin Liu

    • Physics Department, University of Maryland
    • Department of Physics, University of Maryland, College Park
    • University of Maryland, College Park
    • NIST Center for Neutron Research

  • Wesley T Fuhrman

    • Maryland Quantum Materials Center, Department of Physics, University of Maryland College Park
    • University of Maryland, College Park
    • Center for Quantum Materials, University of Maryland

  • 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

  • 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

  • Steven Anlage

    • University of Maryland, College Park
    • Department of Physics and Department of Electrical and Computer Engineering, University of Maryland, College Park
    • Physics Department, University of Maryland, College Park
    • Center for Quantum Materials, University of Maryland