First-order phase transition by a spin-flip potential in BCS superconductivity

Abstract

A spin-flip potential $V$ is introduced in a BCS Hamiltonian in order to study a possible thermodynamic effect that might be caused by the addition of a magnetic impurity in a superconductor. We found that the competition between the pairing and the spin-flip effect, caused by the interaction between the itinerant electrons and the spin of the impurity, gives rise to a first-order phase transition for certain values of $V$. The phase diagram shows a tricritical point in a frontier line which is topologically similar to those found in the phase diagrams of some Ising-like models.

References in corpus (5)

• Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
• Calorimetric Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in the Layered Organic Superconductor κ$-(BEDT-TTF)$_2$Cu(NCS)$_2$
• Single magnetic adsorbates on s-wave superconductors
• An unusual continuous paramagnetic-limited superconducting phase transition in 2D NbSe${}_2$
• First-Order Superconducting Transition of Sr2RuO4

Cited by in corpus (1)

• Linear Criterion for an Upper Bound on the Bardeen-Cooper-Schrieffer Critical Temperature