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Evidence of unconventional superconductivity on the surface of the nodal semimetal CaAg1−xPdxP

Author

Listed:
  • Rikizo Yano

    (Nagoya University)

  • Shota Nagasaka

    (Nagoya University)

  • Naoki Matsubara

    (Nagoya University)

  • Kazushige Saigusa

    (Nagoya University)

  • Tsuyoshi Tanda

    (Nagoya University)

  • Seiichiro Ito

    (Nagoya University)

  • Ai Yamakage

    (Nagoya University)

  • Yoshihiko Okamoto

    (Nagoya University
    the University of Tokyo)

  • Koshi Takenaka

    (Nagoya University)

  • Satoshi Kashiwaya

    (Nagoya University)

Abstract

Surface states of topological materials provide extreme electronic states for unconventional superconducting states. CaAg1−xPdxP is an ideal candidate for a nodal-line Dirac semimetal with drumhead surface states and no additional bulk bands. Here, we report that CaAg1−xPdxP has surface states that exhibit unconventional superconductivity (SC) around 1.5 K. Extremely sharp magnetoresistance, tuned by surface-sensitive gating, determines the surface origin of the ultrahigh-mobility “electrons.” The Pd-doping elevates the Fermi level towards the surface states, and as a result, the critical temperature (Tc) is increased up to 1.7 K from 1.2 K for undoped CaAgP. Furthermore, a soft point-contact study at the surface of Pd-doped CaAgP proved the emergence of unconventional SC on the surface. We observed the bell-shaped conductance spectra, a hallmark of the unconventional SC. Ultrahigh mobility carriers derived from the surface flat bands generate a new class of unconventional SC.

Suggested Citation

  • Rikizo Yano & Shota Nagasaka & Naoki Matsubara & Kazushige Saigusa & Tsuyoshi Tanda & Seiichiro Ito & Ai Yamakage & Yoshihiko Okamoto & Koshi Takenaka & Satoshi Kashiwaya, 2023. "Evidence of unconventional superconductivity on the surface of the nodal semimetal CaAg1−xPdxP," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42535-5
    DOI: 10.1038/s41467-023-42535-5
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    References listed on IDEAS

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