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Tuning of the flat band and its impact on superconductivity in Mo5Si3−xPx

Author

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  • Rustem Khasanov

    (Paul Scherrer Institute)

  • Bin-Bin Ruan

    (Chinese Academy of Sciences)

  • Yun-Qing Shi

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Gen-Fu Chen

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Hubertus Luetkens

    (Paul Scherrer Institute)

  • Zhi-An Ren

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Zurab Guguchia

    (Paul Scherrer Institute)

Abstract

The superconductivity in systems containing dispersionless (flat) bands is seemingly paradoxical, as traditional Bardeen-Cooper-Schrieffer theory requires an infinite enhancement of the carrier masses. However, the combination of flat and steep (dispersive) bands within the multiple band scenario might boost superconducting responses, potentially explaining high-temperature superconductivity in cuprates and metal hydrides. Here, we report on the magnetic penetration depths, the upper critical field, and the specific heat measurements, together with the first-principles calculations for the Mo5Si3−xPx superconducting family. The band structure features a flat band that gradually approaches the Fermi level as a function of phosphorus doping x, reaching the Fermi level at x ≃ 1.3. This leads to an abrupt change in nearly all superconducting quantities. The superfluid density data placed on the ’Uemura plot‘ results in two separated branches, thus indicating that the emergence of a flat band enhances correlations between conducting electrons.

Suggested Citation

  • Rustem Khasanov & Bin-Bin Ruan & Yun-Qing Shi & Gen-Fu Chen & Hubertus Luetkens & Zhi-An Ren & Zurab Guguchia, 2024. "Tuning of the flat band and its impact on superconductivity in Mo5Si3−xPx," Nature Communications, Nature, vol. 15(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46514-2
    DOI: 10.1038/s41467-024-46514-2
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