Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors: Application to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Abstract

The discovery of the multiple $H\text{\ensuremath{-}}T$ phase diagram of ${\mathrm{CeRh}}_{2}{\mathrm{As}}_{2}$ offers a new route to designing topological superconductors. Although weak-coupling theories explain the experimental phase diagram qualitatively, a quantitative discrepancy between them has discouraged a conclusive interpretation. In this Letter, we thoroughly study the effect of the Coulomb interaction and the phase diagrams of locally noncentrosymmetric superconductors. We reveal an even-odd parity transition and the enhancement of the parity transition field in strongly correlated superconductors, and an issue of ${\mathrm{CeRh}}_{2}{\mathrm{As}}_{2}$ is resolved.

Topics & Concepts