Fermi surface evolution and d-wave superconductivity in CeCoIn5: Analysis based on LDA+DMFT method

Takuya Nomoto and Hiroaki Ikeda
Phys. Rev. B 90, 125147 – Published 26 September 2014

Abstract

Based on the advanced first-principles theoretical approach, we investigate the superconducting gap structure and the pairing glue in the heavy-fermion superconductor CeCoIn5. Unexpectedly, the nesting function in the original GGA-based band structure, which is considered to be consistent with the dHvA measurement, shows a Q structure incompatible with experimental observations. Instead we find the importance of the temperature-dependent Fermi surface evolution driven by electron correlations, which has been calculated by the DMFT method. Considering this effect, we obtain reasonable antiferromagnetic correlation, which can also induce the expected d-wave superconductivity. The system encounters the superconducting transition, before a part of the Fermi surface is formed. Similar effects can be expected in generic heavy-fermion superconductors.

    • Received 12 June 2014
    • Revised 4 September 2014

    DOI:https://doi.org/10.1103/PhysRevB.90.125147

    ©2014 American Physical Society

    Authors & Affiliations

    Takuya Nomoto1,* and Hiroaki Ikeda1,2

    • 1Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
    • 2Department of Physics, Ritsumeikan University, Kusatsu, 525-8577, Japan

    • *nomoto.takuya@scphys.kyoto-u.ac.jp

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    Issue

    Vol. 90, Iss. 12 — 15 September 2014

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