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Anomalous normal fluid response in a chiral superconductor UTe2

Author

Listed:
  • Seokjin Bae

    (University of Maryland
    University of Illinois Urbana-Champaign)

  • Hyunsoo Kim

    (University of Maryland
    Texas Tech University)

  • Yun Suk Eo

    (University of Maryland)

  • Sheng Ran

    (University of Maryland
    National Institute of Standards and Technology
    Washington University)

  • I-lin Liu

    (University of Maryland
    National Institute of Standards and Technology)

  • Wesley T. Fuhrman

    (University of Maryland)

  • Johnpierre Paglione

    (University of Maryland
    The Canadian Institute for Advanced Research)

  • Nicholas P. Butch

    (University of Maryland
    National Institute of Standards and Technology)

  • Steven M. Anlage

    (University of Maryland)

Abstract

Chiral superconductors have been proposed as one pathway to realize Majorana normal fluid at its boundary. However, the long-sought 2D and 3D chiral superconductors with edge and surface Majorana normal fluid are yet to be conclusively found. Here, we report evidence for a chiral spin-triplet pairing state of UTe2 with surface normal fluid response. The microwave surface impedance of the UTe2 crystal was measured and converted to complex conductivity, which is sensitive to both normal and superfluid responses. The anomalous residual normal fluid conductivity supports the presence of a significant normal fluid response. The superfluid conductivity follows the temperature behavior predicted for an axial spin-triplet state, which is further narrowed down to a chiral spin-triplet state with evidence of broken time-reversal symmetry. Further analysis excludes trivial origins for the observed normal fluid response. Our findings suggest that UTe2 can be a new platform to study exotic topological excitations in higher dimension.

Suggested Citation

  • Seokjin Bae & Hyunsoo Kim & Yun Suk Eo & Sheng Ran & I-lin Liu & Wesley T. Fuhrman & Johnpierre Paglione & Nicholas P. Butch & Steven M. Anlage, 2021. "Anomalous normal fluid response in a chiral superconductor UTe2," Nature Communications, Nature, vol. 12(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22906-6
    DOI: 10.1038/s41467-021-22906-6
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