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

  • Regular Article - Solid State and Materials
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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, \(|\Delta _{11}(T)|\) and \(|\Delta _{22}(T)|\), are investigated as function of temperature, T, inter-orbital hopping parameter, \(t_4\), and electron doping, N. The values of the two ratios \(2|\Delta ^0_{11}|/T_c\) and \(2|\Delta ^0_{22}|/T_c\) are not universal, and they are strongly dependent on the value of the hopping parameter, \(t_4\). In the case of \(s^\pm \)-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.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: This is a theoretical study with no experimental data. All numerical data generated during this study are available on reasonable request.]

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Acknowledgements

Numerical calculations were performed at LANA, UFSM, Brazil. One of the authors, IT, would like to acknowledge the financial support received from the internal research program at CSUF.

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Authors and Affiliations

  1. Laboratory SUPERCOMP, Physics Department, FACYT-UC, Carabobo, Venezuela

    J. J. Rodríguez Núñez

  2. Departamento de Matemática, CCNE, UFSM, Santa Maria, RS, CEP 97.105-900, Brazil

    A. A. Schmidt

  3. Department of Physics, California State University, Fullerton, CA, 92831, USA

    I. Tifrea

Authors
  1. J. J. Rodríguez Núñez
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  2. A. A. Schmidt
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  3. I. Tifrea
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All authors contributed equally to the paper.

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Correspondence to I. Tifrea.

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Núñez, J.J.R., Schmidt, A.A. & Tifrea, I. Inter-orbital hopping effects on the superconducting state properties of a two-band BCS model. Eur. Phys. J. B 96, 104 (2023). https://doi.org/10.1140/epjb/s10051-023-00571-6

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