Interorbital singlet pairing in Sr2RuO4: A Hund's superconductor
Artikel i vetenskaplig tidskrift, 2022

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.

Författare

Stefan Käser

Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)

Max-Planck-Gesellschaft

Hugo Strand

Chalmers, Fysik

Simons Foundation

Örebro universitet

Nils Wentzell

Simons Foundation

A. Georges

Université de Genève

Collège de France

Simons Foundation

École polytechnique

Olivier Parcollet

Simons Foundation

Université Paris-Saclay

Philipp Hansmann

Max-Planck-Gesellschaft

Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 105 15 155101

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.105.155101

Mer information

Senast uppdaterat

2022-05-04