Interorbital singlet pairing in Sr2RuO4: A Hund's superconductor

Käser S, Strand HU, Wentzell N, Georges A, Parcollet O, Hansmann P (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Physical Review B American Physical Society

Book Volume: 105

Article Number: 155101

Journal Issue: 15

DOI: 10.1103/PhysRevB.105.155101

Abstract

We study the superconducting gap function of Sr2RuO4. By solving the linearized Eliashberg equation with a correlated pairing vertex extracted from a dynamical mean-field calculation we identify the dominant pairing channels. An analysis of the candidate gap functions in orbital and quasiparticle band basis reveals that an interorbital singlet pairing of even parity is in agreement with experimental observations. It reconciles in particular the occurrence of a two-component order parameter with the presence of line nodes of quasiparticles along the c axis in the superconducting phase. The strong angular dependence of the gap along the Fermi surface is in stark contrast to its quasilocality when expressed in the orbital basis. We identify local interorbital spin correlations as the driving force for the pairing and thus reveal the continuation of Hund's physics into the superconducting phase.

Authors with CRIS profile

Philipp Hansmann Professur für Theoretische Physik mit dem Schwerpunkt Molekulare Materialien

Involved external institutions

Max-Planck-Institut für Festkörperforschung DE Germany (DE) Örebro University SE Sweden (SE) Simons Foundation US United States (USA) (US)

How to cite

APA:

Käser, S., Strand, H.U., Wentzell, N., Georges, A., Parcollet, O., & Hansmann, P. (2022). Interorbital singlet pairing in Sr2RuO4: A Hund's superconductor. Physical Review B, 105(15). https://doi.org/10.1103/PhysRevB.105.155101

MLA:

Käser, Stefan, et al. "Interorbital singlet pairing in Sr2RuO4: A Hund's superconductor." Physical Review B 105.15 (2022).

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