Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F57: Superconductivity: Unconventional Theories I
8:00 AM–10:48 AM,
Tuesday, March 15, 2022
Room: Hyatt Regency Hotel -Clark
Sponsoring
Unit:
DCMP
Chair: Benjamin Fregoso, Kent State University
Abstract: F57.00009 : Spin triplet superconductivity driven by finite momentum spin fluctuations
9:36 AM–9:48 AM
Presenter:
Andreas Kreisel
(Univ Leipzig)
Authors:
Andreas Kreisel
(Univ Leipzig)
Peter J Hirschfeld
(University of Florida)
Yundi Quan
(University of Florida)
and are often discussed in terms of a simple, 3He-like picture where ferromagnetic spin
fluctuations provide the "glue". However, in some cases where reliable inelastic neutron
scattering measurements are available, spin excitations are found to be peaked at finite
momentum rather than at q=0. Here we investigate some simple models that exhibit
triplet pairing arising from antiferromagnetic spin fluctuations. We show that a strong
peak at larger momentum in the magnetic susceptibility can drive such states,
typically leading to additional nodes in the gap function. In these situations, dominant pair
scattering processes occur between Fermi surface segments with like signs of the
superconducting order parameter, yet are consistent with an overall odd parity state.
We examine the applicability of these scenarios to the putative triplet superconductor
UTe2 by calculations based on three dimensional Fermi surfaces.
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