Reentrant superconductivity due to inter-band off-diagonal hopping in a two-band superconductivity model

J. J. Rodríguez Núñez (), A. A. Schmidt () and I. Tifrea ()
Additional contact information
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, 2022, vol. 95, issue 11, 1-8

Abstract: Abstract We present a possible phase diagram for the superconductivity state in a two-band scenario that includes contributions from the inter-orbital off-diagonal hopping term. Our model accounts for intra-band attractive electron–electron interactions that leads to the formation of superconducting Cooper pairs in each component band and for an inter-band attractive electron–electron interaction responsible for a single superconductive transition temperature $$T_\textrm{c}$$ T c in the model. Using a mean field approximation, we obtained an analytical equation for the superconducting critical temperature that includes contributions from a hybridization term due to the mixing of the two electron bands. For a numerical solution of this equation, we considered a band structure that reproduced as much as possible the situation in the Ba $$_{1-x}$$ 1 - x K $$_x$$ x Fe $$_2$$ 2 As $$_2$$ 2 pnictide superconductor material. Our possible phase diagram $$T_\textrm{c}$$ T c vs. N is obtained assuming that Cooper pairs in both electron bands have either s-wave or $$s^\pm $$ s ± -wave symmetry. The main result of our calculation is the existence of a complex phase diagram that at different inter-orbital hopping strengths can have one or two local maxima for the transition critical temperature $$T_\textrm{c}$$ T c . The electron concentration at which these maxima occur in the phase diagram can be tuned using the inter-orbital off-diagonal hopping term. Graphic abstract

Date: 2022
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DOI: 10.1140/epjb/s10051-022-00447-1

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