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

J. J. Rodríguez Núñez, A. A. Schmidt and I. Tifrea ()
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J. J. Rodríguez Núñez: FACYT-UC
A. A. Schmidt: CCNE, UFSM
I. Tifrea: California State University

The European Physical Journal B: Condensed Matter and Complex Systems, 2023, vol. 96, issue 7, 1-7

Abstract: Abstract 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, $$|\Delta _{11}(T)|$$ | Δ 11 ( T ) | and $$|\Delta _{22}(T)|$$ | Δ 22 ( T ) | , are investigated as function of temperature, T, inter-orbital hopping parameter, $$t_4$$ t 4 , and electron doping, N. The values of the two ratios $$2|\Delta ^0_{11}|/T_c$$ 2 | Δ 11 0 | / T c and $$2|\Delta ^0_{22}|/T_c$$ 2 | Δ 22 0 | / T c are not universal, and they are strongly dependent on the value of the hopping parameter, $$t_4$$ t 4 . In the case of $$s^\pm $$ 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

Date: 2023
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DOI: 10.1140/epjb/s10051-023-00571-6

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