Finite-momentum superconductivity induced by an altermagnetic order in κ-type organic compounds

by Shuntaro Sumita (University of Tokyo)

Thursday 20 Jun 2024, 10:30 → 11:30 Europe/Zurich

WHGA/121

We investigate superconductivity under a spin-split band structure owing to a collinear-type altermagnetic order in organic salts κ-(ET)2X, by using the following two types of analyses:
(1) an effective model with simple intraband attractive interactions, and
(2) many-body calculations of the repulsive Hubbard model based on FLEX approximation and the linearized Eliashberg equation.

Our results show that the magnetic order can induce a Fulde–Ferrell–Larkin–Ovchinnikov state, where the Cooper pair possesses a finite center-of-mass momentum, without applying an external magnetic field.

Reference:
S. Sumita, M. Naka, and H. Seo, Phys. Rev. Research 5, 043171 (2023)