Superconductivity near a nematoelastic quantum critical point
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2022
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We study the pairing instability of a two-dimensional metallic system induced by Ising-nematic quantum
fluctuations in the presence of an unavoidable relevant coupling of the nematic order parameter to the elastic
modes (acoustic phonons) of the lattice. We find that this nematoelastic coupling λlatt leads to a decrease of
both the superconducting (SC) critical temperature Tc and the gap function , regardless of the gap symmetry.
Interestingly, we show that λlatt provides a knob that allows us to investigate the emergence of the SC phase
at low temperatures, as an instability from either a non-Fermi liquid or a Fermi liquid normal state. The phase
transitions between the SC and these normal states are characterized by different critical exponents, which may
also vary for each gap symmetry. Finally, we argue that these results might explain the dependence of Tc in the
vicinity of the nematic quantum critical point exhibited by the compound FeSe1−xSx .
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CARVALHO, Vanuildo S. de; FREIRE, Hermann. Superconductivity near a nematoelastic quantum critical point. Physical Review B, College Park, v. 105, p. L220501-L220501-6, 2022. Disponivel em: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.L220501. Acesso em: 31 maio 2023.