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
Max-Planck-Gesellschaft
Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)
Hugo Strand
Örebro universitet
Flatiron Institute
Chalmers, Fysik
Nils Wentzell
Flatiron Institute
A. Georges
École polytechnique
Université de Genève
Collège de France
Flatiron Institute
Olivier Parcollet
Université Paris-Saclay
Flatiron Institute
Philipp Hansmann
Max-Planck-Gesellschaft
Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)
Physical Review B
2469-9950 (ISSN) 2469-9969 (eISSN)
Vol. 105 15 155101Ämneskategorier
Den kondenserade materiens fysik
DOI
10.1103/PhysRevB.105.155101