Finite temperature phase diagrams of a two-band model of superconductivity

We explore the temperature effects in the superconducting phases of a hybridized two-band system. We show that for zero hybridization between the bands, there are two different critical temperatures. However, for any finite hybridization there is only one critical temperature at which the two gaps v...

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Bibliographic Details
Published in:Annals of physics 2018-07, Vol.394, p.17-32
Main Authors: Caldas, Heron, Celes, A., Nozadze, David
Format: Article
Language:English
Subjects:
ASYMMETRY
BCS THEORY
BCS theory of superconductivity
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL TEMPERATURE
Hybridization among orbitals
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
Phase transitions
Reentrant phase
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
Two-band model of superconductivity
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Summary:We explore the temperature effects in the superconducting phases of a hybridized two-band system. We show that for zero hybridization between the bands, there are two different critical temperatures. However, for any finite hybridization there is only one critical temperature at which the two gaps vanish simultaneously. We construct the phase diagrams of the critical temperature versus hybridization parameter α and critical temperature versus critical chemical potential asymmetry δμ between the bands, identifying the superconductor and normal phases in the system. We find an interesting reentrant behavior in the superconducting phase as the parameters α or δμ, which drive the phase transitions, increase. We also find that for optimal values of both α and δμ there is a significant enhancement of the critical temperature of the model.
ISSN:0003-4916
1096-035X
DOI:10.1016/j.aop.2018.04.022