Superconductivity in the presence of spin-orbit interactions stabilized by Hund coupling

Cheung, Alfred K. C.; Agterberg, D. F.

doi:10.1103/physrevb.99.024516

Superconductivity in the presence of spin-orbit interactions stabilized by Hund coupling

Journal Article · Mon Jan 28 23:00:00 EST 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.024516· OSTI ID:1503405

Cheung, Alfred K. C. ^[1]; Agterberg, D. F. ^[2]

Stanford Univ., Stanford, CA (United States)
Univ. of Wisconsin, Milwaukee, WI (United States)

The intraorbital repulsive Hubbard interaction cannot lead to attractive superconducting pairing states, except through the Kohn-Luttinger mechanism. This situation may change when we include additional local interactions such as the interorbital repulsion U' and Hund interactions J. Adding these local interactions, we study the nature of the superconducting pairs in systems with tetragonal crystal symmetry including the d_xz and d_yz orbitals, and in octahedral systems including all three of d_xz, d_yz, and d_xy orbitals. In the tetragonal case, spin-orbit interactions can stabilize attractive pairing channels containing a spin triplet, orbital singlet character. Here, depending on the form of spin-orbit coupling, pairing channels belonging to degenerate, nontrivial irreducible representations may be stabilized. In the octahedral case, the pairing interactions of superconducting channels are found to depend critically on the number of bands crossing the Fermi energy.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1503405

Alternate ID(s):: OSTI ID: 1492751

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 99; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Exotic Cooper pairing in multiorbital models of Sr 2 RuO 4 Huang, Wen; Zhou, Yi; Yao, Hong Physical Review B, Vol. 100, Issue 13 https://doi.org/10.1103/physrevb.100.134506	journal	October 2019
Bogoliubov Fermi surfaces stabilized by spin-orbit coupling Menke, Henri; Timm, C.; Brydon, P. M. R. Physical Review B, Vol. 100, Issue 22 https://doi.org/10.1103/physrevb.100.224505	journal	December 2019

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