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Two-component nematic superconductivity in 4Hb-TaS2

Author

Listed:
  • I. Silber

    (Tel - Aviv University)

  • S. Mathimalar

    (Weizmann Institute of Science)

  • I. Mangel

    (Technion-Israel Institute of Technology)

  • A. K. Nayak

    (Weizmann Institute of Science)

  • O. Green

    (Tel - Aviv University)

  • N. Avraham

    (Weizmann Institute of Science)

  • H. Beidenkopf

    (Weizmann Institute of Science)

  • I. Feldman

    (Technion-Israel Institute of Technology)

  • A. Kanigel

    (Technion-Israel Institute of Technology)

  • A. Klein

    (Department of Physics, Faculty of Natural Sciences, Ariel University
    The Weizmann Institute of Science)

  • M. Goldstein

    (Tel - Aviv University)

  • A. Banerjee

    (Ben-Gurion University of the Negev)

  • E. Sela

    (Tel - Aviv University)

  • Y. Dagan

    (Tel - Aviv University)

Abstract

Most superconductors have an isotropic, single component order parameter and are well described by the standard (BCS) theory for superconductivity. Unconventional, multiple-component superconductors are exceptionally rare and are much less understood. Here, we combine scanning tunneling microscopy and angle-resolved macroscopic transport for studying the candidate chiral superconductor, 4Hb-TaS2. We reveal quasi-periodic one-dimensional modulations in the tunneling conductance accompanied by two-fold symmetric superconducting critical field. The strong modulation of the in-plane critical field, Hc2, points to a nematic, unconventional order parameter. However, the imaged vortex core is isotropic at low temperatures. We suggest a model that reconciles this apparent discrepancy and takes into account previously observed spontaneous time-reversal symmetry breaking at low temperatures. The model describes a competition between a dominating chiral superconducting order parameter and a nematic one. The latter emerges close to the normal phase. Our results strongly support the existence of two-component superconductivity in 4Hb-TaS2 and can provide valuable insights into other systems with coexistent charge order and superconductivity.

Suggested Citation

  • I. Silber & S. Mathimalar & I. Mangel & A. K. Nayak & O. Green & N. Avraham & H. Beidenkopf & I. Feldman & A. Kanigel & A. Klein & M. Goldstein & A. Banerjee & E. Sela & Y. Dagan, 2024. "Two-component nematic superconductivity in 4Hb-TaS2," Nature Communications, Nature, vol. 15(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45169-3
    DOI: 10.1038/s41467-024-45169-3
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    References listed on IDEAS

    as
    1. Lin Jiao & Sean Howard & Sheng Ran & Zhenyu Wang & Jorge Olivares Rodriguez & Manfred Sigrist & Ziqiang Wang & Nicholas P. Butch & Vidya Madhavan, 2020. "Chiral superconductivity in heavy-fermion metal UTe2," Nature, Nature, vol. 579(7800), pages 523-527, March.
    2. Eylon Persky & Anders V. Bjørlig & Irena Feldman & Avior Almoalem & Ehud Altman & Erez Berg & Itamar Kimchi & Jonathan Ruhman & Amit Kanigel & Beena Kalisky, 2022. "Magnetic memory and spontaneous vortices in a van der Waals superconductor," Nature, Nature, vol. 607(7920), pages 692-696, July.
    3. Jun Li & Paulo J. Pereira & Jie Yuan & Yang-Yang Lv & Mei-Ping Jiang & Dachuan Lu & Zi-Quan Lin & Yong-Jie Liu & Jun-Feng Wang & Liang Li & Xiaoxing Ke & Gustaaf Van Tendeloo & Meng-Yue Li & Hai-Luke , 2017. "Nematic superconducting state in iron pnictide superconductors," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
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