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TT: Fachverband Tiefe Temperaturen

TT 9: Poster Session: Correlated Electrons

TT 9.2: Poster

Dienstag, 28. September 2021, 13:30–16:00, P

Spin excitations in the fully gapped hybridized two band superconductor — •Alireza Akbari and Peter Thalmeier — Max Planck Institute for the Chemical Physics of Solids, D-01187 Dresden, Germany

In f-electron heavy fermion superconductors, the presence of a spin resonance in the inelastic magnetic response is commonly associated with an unconventional nodal gap function that is not fully symmetric. However, it appears possible that the resonance is still observed even when the low-temperature thermodynamic behavior suggests a fully gapped state. We investigate such possibility within a two-dimensional toy model of a hybridized superconductor with a fully symmetric unconventional symmetry with a different sign of the gap function on disjoint Fermi surface sheets. We compute the collective magnetic response function in the hybridized superconducting state of the two-band model and show that the appearance of the resonance is also possible for the fully gapped state.[1]
[1] A. Akbari, P. Thalmeier, Annals of Physics 428, 168433 (2021)