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Electronic compressibility and high-Tc superconductivity : new links

Luca de’ Medici, ESPCI, Paris


In multi-orbital Hubbard models including strong intra-atomic exchange a so-called "Hund’s metal” phase is realized that, among other hallmarks, typically shows a strong differentiation in the degree of correlation of the conduction electrons based on their orbital character. This selective physics is also a key player in Iron-based superconductors (FeSC), where a wealth of experimental evidence validates this theoretical picture.
We here show that at the frontier between this Hund’s metal phase and a conventional metal, the electronic compressibility is strongly enhanced or even divergent, and that among the FeSC, those that have a high Tc are placed in our simulations on this frontier.
The same theoretical evidence of enhanced compressibility at the frontier between a phase with selective correlations and a more conventional metal is found in cuprates, and we will outline the main indications for a common scenario of high-Tc superconductivity.

[1] : L. de’ Medici, G. Giovannetti and M. Capone, PRL 112, 177001 (2014).
[2] : L. de’ Medici, Phys. Rev. Lett. 118, 167003 (2017).
[3] : P. Villar Arribi and L. de’ Medici, Phys. Rev. Lett. 121, 197001 (2018).
[4] : M. Chatzieleftheriou et al., arXiv:2009.04304.

Agenda

séminaire

  • Jeudi 24 septembre 11:00-12:30 - Luca de' Medici - ESPCI, Paris

    Electronic compressibility and high-Tc superconductivity : new links - Luca de’ Medici

    Résumé : In multi-orbital Hubbard models including strong intra-atomic exchange a so-called "Hund’s metal” phase is realized that, among other hallmarks, typically shows a strong differentiation in the degree of correlation of the conduction electrons based on their orbital character. This selective physics is also a key player in Iron-based superconductors (FeSC), where a wealth of experimental evidence validates this theoretical picture.
    We here show that at the frontier between this Hund’s metal phase and a conventional metal, the electronic compressibility is strongly enhanced or even divergent, and that among the FeSC, those that have a high Tc are placed in our simulations on this frontier.
    The same theoretical evidence of enhanced compressibility at the frontier between a phase with selective correlations and a more conventional metal is found in cuprates, and we will outline the main indications for a common scenario of high-Tc superconductivity.
    [1] : L. de’ Medici, G. Giovannetti and M. Capone, PRL 112, 177001 (2014).
    [2] : L. de’ Medici, Phys. Rev. Lett. 118, 167003 (2017).
    [3] : P. Villar Arribi and L. de’ Medici, Phys. Rev. Lett. 121, 197001 (2018).
    [4] : M. Chatzieleftheriou et al., arXiv:2009.04304.

    Lieu : LPS bat. 510, Moyen amphi


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