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

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 betw...

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Bibliographic Details
Published in:arXiv.org 2018-01
Main Authors: Rodriguez Salmon, Octavio D, Igor Tavares Padilha, Neto, Francisco Dinóla
Format: Article
Language:English
Subjects:
Electron spin
Impurities
Ising model
Phase diagrams
Phase transitions
Superconductivity
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1801.07377