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Broadened quantum critical ground state in a disordered superconducting thin film

Author

Listed:
  • Koichiro Ienaga

    (Tokyo Institute of Technology)

  • Yutaka Tamoto

    (Tokyo Institute of Technology)

  • Masahiro Yoda

    (Tokyo Institute of Technology)

  • Yuki Yoshimura

    (Tokyo Institute of Technology)

  • Takahiro Ishigami

    (Tokyo Institute of Technology)

  • Satoshi Okuma

    (Tokyo Institute of Technology)

Abstract

A superconductor-insulator transition (SIT) in two dimensions is a prototypical quantum phase transition (QPT) with a clear quantum critical point (QCP) at zero temperature (T = 0). The SIT is induced by a field B and observed in disordered thin films. In some of weakly disordered or crystalline thin films, however, an anomalous metallic (AM) ground state emerges over a wide B range between the superconducting and insulating phases. It remains a fundamental open question how the QPT picture of the SIT is modified when the AM state appears. Here we present measurements of the Nernst effect N, which has great sensitivity to the fluctuations of the superconducting order parameter. From a thorough contour map of N in the B-T plane, we found a thermal-to-quantum crossover line of the superconducting fluctuations, a so-called ghost-temperature line associated with the QPT, as well as a ghost-field line associated with a thermal transition. The QCP is identified as a T = 0 intercept of the ghost-temperature line inside the AM state, which verifies that the AM state is a broadened critical state of the SIT.

Suggested Citation

  • Koichiro Ienaga & Yutaka Tamoto & Masahiro Yoda & Yuki Yoshimura & Takahiro Ishigami & Satoshi Okuma, 2024. "Broadened quantum critical ground state in a disordered superconducting thin film," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46628-7
    DOI: 10.1038/s41467-024-46628-7
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    References listed on IDEAS

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    1. Z. A. Xu & N. P. Ong & Y. Wang & T. Kakeshita & S. Uchida, 2000. "Vortex-like excitations and the onset of superconducting phase fluctuation in underdoped La2-xSrxCuO4," Nature, Nature, vol. 406(6795), pages 486-488, August.
    2. Chao Yang & Haiwen Liu & Yi Liu & Jiandong Wang & Dong Qiu & Sishuang Wang & Yang Wang & Qianmei He & Xiuli Li & Peng Li & Yue Tang & Jian Wang & X. C. Xie & James M. Valles & Jie Xiong & Yanrong Li, 2022. "Signatures of a strange metal in a bosonic system," Nature, Nature, vol. 601(7892), pages 205-210, January.
    3. S. Poran & T. Nguyen-Duc & A. Auerbach & N. Dupuis & A. Frydman & Olivier Bourgeois, 2017. "Quantum criticality at the superconductor-insulator transition revealed by specific heat measurements," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
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