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Superconductivity mediated by polar modes in ferroelectric metals

Author

Listed:
  • C. Enderlein

    (University of Cambridge
    Centro Brasileiro de Pesquisas Físicas
    UFRJ)

  • J. Ferreira Oliveira

    (University of Cambridge
    Centro Brasileiro de Pesquisas Físicas)

  • D. A. Tompsett

    (University of Cambridge)

  • E. Baggio Saitovitch

    (Centro Brasileiro de Pesquisas Físicas)

  • S. S. Saxena

    (University of Cambridge
    National University of Science and Technology MISiS)

  • G. G. Lonzarich

    (University of Cambridge)

  • S. E. Rowley

    (University of Cambridge
    Centro Brasileiro de Pesquisas Físicas)

Abstract

The occurrence of superconductivity in doped SrTiO3 at low carrier densities points to the presence of an unusually strong pairing interaction that has eluded understanding for several decades. We report experimental results showing the pressure dependence of the superconducting transition temperature, Tc, near to optimal doping that sheds light on the nature of this interaction. We find that Tc increases dramatically when the energy gap of the ferroelectric critical modes is suppressed, i.e., as the ferroelectric quantum critical point is approached in a way reminiscent to behaviour observed in magnetic counterparts. However, in contrast to the latter, the coupling of the carriers to the critical modes in ferroelectrics is predicted to be small. We present a quantitative model involving the dynamical screening of the Coulomb interaction and show that an enhancement of Tc near to a ferroelectric quantum critical point can arise due to the virtual exchange of longitudinal hybrid-polar-modes, even in the absence of a strong coupling to the transverse critical modes.

Suggested Citation

  • C. Enderlein & J. Ferreira Oliveira & D. A. Tompsett & E. Baggio Saitovitch & S. S. Saxena & G. G. Lonzarich & S. E. Rowley, 2020. "Superconductivity mediated by polar modes in ferroelectric metals," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18438-0
    DOI: 10.1038/s41467-020-18438-0
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    Cited by:

    1. Xi Wang & Anirban Kundu & Bochao Xu & Sajna Hameed & Nadav Rothem & Shai Rabkin & Luka Rogić & Liam Thompson & Alexander McLeod & Martin Greven & Damjan Pelc & Ilya Sochnikov & Beena Kalisky & Avraham, 2024. "Multiferroicity in plastically deformed SrTiO3," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Xiaoyang Chen & Tianlun Yu & Yuan Liu & Yanqiu Sun & Minyinan Lei & Nan Guo & Yu Fan & Xingtian Sun & Meng Zhang & Fatima Alarab & Vladimir N. Strocov & Yilin Wang & Tao Zhou & Xinyi Liu & Fanjin Lu &, 2024. "Orientation-dependent electronic structure in interfacial superconductors LaAlO3/KTaO3," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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