Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q43: Novel Topological Superconductors
3:00 PM–6:00 PM,
Wednesday, March 8, 2023
Room: Room 317
Sponsoring
Unit:
DMP
Chair: Sean Thomas, Los Alamos National Laboratory
Abstract: Q43.00007 : A mechanism for time-reversal broken superconductivity in UTe2*
4:36 PM–4:48 PM
Presenter:
Tamaghna Hazra
(Rutgers University)
Authors:
Tamaghna Hazra
(Rutgers University)
Pavel Volkov
(Harvard University; University of Connecticut)
To address this puzzle, we study the thermodynamic phase diagrams of superconductors with two non-degenerate order parameters close to a magnetic instability using Landau theory. We demonstrate that finite coupling between magnetic and superconducting orders can drive a weakly first order transition from a metal to a time-reversal breaking superconductor. A microscopic origin of this coupling is identified as screening of magnetic moments by chiral Cooper pairs, built out of the two non-degenerate pairs - an extension of Kondo screening to unconventional pairs. We discuss the experimental signatures of such a weakly first order transition and the resulting phase diagram.
*This work is supported by the National Science Foundation Grant No. DMR-1830707
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