Inter-orbital hopping effects on the superconducting state properties of a two-band BCS model

We analyze the superconducting state properties for the case of a two-band self-consistent BCS model that considers an electron band structure suitable for iron based superconducting materials. The superconducting gap parameters corresponding to each component electron band, | Δ 11 ( T ) | and | Δ 2...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2023-07, Vol.96 (7), Article 104
Main Authors: Núñez, J. J. Rodríguez, Schmidt, A. A., Tifrea, I.
Format: Article
Language:English
Subjects:
Analysis
Complex Systems
Condensed Matter Physics
Doping
Fluid- and Aerodynamics
Iron
Mathematical models
Parameters
Phase diagrams
Physics
Physics and Astronomy
Regular Article - Solid State and Materials
Solid State Physics
Superconductivity
Superconductors
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Summary:We analyze the superconducting state properties for the case of a two-band self-consistent BCS model that considers an electron band structure suitable for iron based superconducting materials. The superconducting gap parameters corresponding to each component electron band, | Δ 11 ( T ) | and | Δ 22 ( T ) | , are investigated as function of temperature, T , inter-orbital hopping parameter, t 4 , and electron doping, N . The values of the two ratios 2 | Δ 11 0 | / T c and 2 | Δ 22 0 | / T c are not universal, and they are strongly dependent on the value of the hopping parameter, t 4 . In the case of s ± -wave symmetry, the superconducting state in the system exists only at certain electron doping concentrations, leading to a complex superconducting phase diagram for iron based superconducting materials. Graphic abstract
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/s10051-023-00571-6