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A large modulation of electron-phonon coupling and an emergent superconducting dome in doped strong ferroelectrics

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  • Jiaji Ma

    (NYU Shanghai)

  • Ruihan Yang

    (NYU Shanghai)

  • Hanghui Chen

    (NYU Shanghai
    New York University)

Abstract

We use first-principles methods to study doped strong ferroelectrics (taking BaTiO3 as a prototype). Here, we find a strong coupling between itinerant electrons and soft polar phonons in doped BaTiO3, contrary to Anderson/Blount’s weakly coupled electron mechanism for "ferroelectric-like metals”. As a consequence, across a polar-to-centrosymmetric phase transition in doped BaTiO3, the total electron-phonon coupling is increased to about 0.6 around the critical concentration, which is sufficient to induce phonon-mediated superconductivity of about 2 K. Lowering the crystal symmetry of doped BaTiO3 by imposing epitaxial strain can further increase the superconducting temperature via a sizable coupling between itinerant electrons and acoustic phonons. Our work demonstrates a viable approach to modulating electron-phonon coupling and inducing phonon-mediated superconductivity in doped strong ferroelectrics and potentially in polar metals. Our results also show that the weakly coupled electron mechanism for "ferroelectric-like metals” is not necessarily present in doped strong ferroelectrics.

Suggested Citation

  • Jiaji Ma & Ruihan Yang & Hanghui Chen, 2021. "A large modulation of electron-phonon coupling and an emergent superconducting dome in doped strong ferroelectrics," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22541-1
    DOI: 10.1038/s41467-021-22541-1
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