Identifying spin-triplet pairing in spin-orbit coupled multi-band superconductors
Abstract
We investigate the combined effect of Hund's and spin-orbit (SO) coupling on superconductivity in multi-orbital systems. Hund's interaction leads to orbital-singlet spin-triplet superconductivity, where the Cooper pair wave function is antisymmetric under the exchange of two orbitals. We identify three d-vectors describing even-parity orbital-singlet spin-triplet pairings among t2g-orbitals, and find that the three d-vectors are mutually orthogonal to each other. SO coupling further assists pair formation, pins the orientation of the d-vector triad, and induces spin-singlet pairings with a relative phase difference of \pi/2. In the band basis the pseudospin d-vectors are aligned along the z-axis and correspond to momentum-dependent inter- and intra-band pairings. We discuss quasiparticle dispersion, magnetic response, collective modes, and experimental consequences in light of the superconductor Sr2RuO4.
Keywords
Cite
@article{arxiv.1101.4656,
title = {Identifying spin-triplet pairing in spin-orbit coupled multi-band superconductors},
author = {Christoph M. Puetter and Hae-Young Kee},
journal= {arXiv preprint arXiv:1101.4656},
year = {2015}
}
Comments
6 pages, 5 figures