Anomalous normal fluid response in chiral spin-triplet superconductor UTe<sub>2</sub>

ORAL

Abstract

We report evidence of significant surface normal fluid response from a chiral spin-triplet pairing state of UTe2. The microwave surface impedance of UTe2 crystals was measured and converted to complex conductivity. The anomalous residual real part of conductivity in the zero temperature limit supports the presence of a significant normal fluid response in the ground state. The imaginary part of conductivity follows the low temperature behavior predicted for the axial spin-triplet state, which is further narrowed down to the chiral spin-triplet state with evidence of broken time-reversal symmetry [1]. The imaginary part of 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 is predicted for the chiral spin-triplet superconductor, will be discussed.

[Ref] S. Bae, et al., arXiv:1909.09032 (2019)
[1] I. M. Hayes, et al., arXiv:2002.02539 (2020).

*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 GBMF9071.

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Presenters

  • Seokjin Bae

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

Authors

  • Seokjin Bae

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

  • Hyunsoo Kim

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

  • Yun Suk Eo

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

  • Sheng Ran

    • National Institute of Standards and Technology
    • NIST Center for Neutron Research, National Institute of Standards and Technology, University of Maryland, College Park
    • Quantum Materials Center, Department of Physics, University of Maryland College Park
    • Physics, Washington University in St. Louis
    • Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park
    • Department of Physics and Astronomy, University of Maryland, College Park
    • Washington University
    • Physics Department, Washington University in St. Louis
    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • Washington University in St. Louis
    • Department of Physics, University of California, San Diego
    • University of Maryland, College Park

  • I-Lin Liu

    • National Institute of Standards and Technology
    • Quantum Materials Center, Department of Physics, University of Maryland College Park
    • University of Maryland, College Park
    • Quantum Materials Center, University of Maryland, College Park

  • Wesley T Fuhrman

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

  • Johnpierre Paglione

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

  • Nicholas Butch

    • National Institute of Standards and Technology
    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • Center for Neutron Research, National Institute of Standards and Technology
    • NCNR, National Institute for Standard and Technology
    • NIST/University of Maryland
    • Center of Neutron Research, National Institute of Standards and Technology, NIST
    • Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards and Technology
    • NIST Center for Neutro Research, National Institute of Standards and Technology
    • University of Maryland

  • Steven M Anlage

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