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Signature of magnetoelectric coupling driven finite momentum pairing in 3D ising superconductor

Author

Listed:
  • F. Z. Yang

    (Oak Ridge National Laboratory)

  • H. D. Zhang

    (Oak Ridge National Laboratory)

  • Saswata Mandal

    (The Pennsylvania State University)

  • F. Y. Meng

    (Renmin University of China
    Renmin University of China)

  • G. Fabbris

    (Argonne National Laboratory)

  • A. H. Said

    (Argonne National Laboratory)

  • P. Mercado Lozano

    (Argonne National Laboratory)

  • A. Rajapitamahuni

    (Brookhaven National Laboratory)

  • E. Vescovo

    (Brookhaven National Laboratory)

  • C. Nelson

    (Brookhaven National Laboratory)

  • S. Lin

    (Oak Ridge National Laboratory)

  • Y. Park

    (Oak Ridge National Laboratory)

  • E. M. Clements

    (Oak Ridge National Laboratory)

  • T. Z. Ward

    (Oak Ridge National Laboratory)

  • H.-N. Lee

    (Oak Ridge National Laboratory)

  • H. C. Lei

    (Renmin University of China
    Renmin University of China)

  • C. X. Liu

    (The Pennsylvania State University)

  • H. Miao

    (Oak Ridge National Laboratory)

Abstract

The finite momentum superconducting paring states (FMPs) represent a forefront of condensed matter physics. Here we report experimental evidence of FMP in a locally noncentrosymmetric bulk superconductor 4Hb-TaS2. Using hard X-ray diffraction and angle-resolved photoemission spectroscopy, we reveal unusual 2D ferro-rotational charge density wave (CDW) and weak interlayer hopping in 4Hb-TaS2. The superconducting upper critical field, Hc2, linearly increases via decreasing temperature, and well exceeds the Pauli limit, suggesting the dominant orbital pair-breaking mechanism. Remarkably, we observed evidence of field-induced superconductivity-to-superconductivity transition that breaks continuous rotational symmetry of the s-wave uniform pairing in the Bardeen-Cooper-Schrieffer theory down to the six-fold rotation symmetry. Ginzburg-Landau free energy analysis shows that magnetoelectric coupling, induced by 2D ferro-rotational CDW, stabilizes FMP that provides an explanation of the lowering rotation symmetry. Our results provide a new understanding of unconventional superconducting behaviors of the bulk quantum heterostructure 4Hb-TaS2.

Suggested Citation

  • F. Z. Yang & H. D. Zhang & Saswata Mandal & F. Y. Meng & G. Fabbris & A. H. Said & P. Mercado Lozano & A. Rajapitamahuni & E. Vescovo & C. Nelson & S. Lin & Y. Park & E. M. Clements & T. Z. Ward & H.-, 2025. "Signature of magnetoelectric coupling driven finite momentum pairing in 3D ising superconductor," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-61882-z
    DOI: 10.1038/s41467-025-61882-z
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