2020
DOI: 10.1103/physrevb.101.094516
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Crossband versus intraband pairing in superconductors: Signatures and consequences of the interplay

Abstract: We analyze the paradigmatic competition between intra-band and cross-band Cooper-pair formation in two-band superconductors, neglected in most works to date. We derive the phase-sensitive gap equations and describe the crossover between the intraband-dominated and the crossbanddominated regimes, delimited by a "gapless" state. Experimental signatures of crosspairing comprise notable gap-splitting in the excitation spectrum, non-BCS behavior of gaps versus temperature, as well as changes in the pairing symmetry… Show more

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Cited by 30 publications
(17 citation statements)
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“…It would be interesting to extend the present study to other FeSC families (e.g., 112 70 , 10-3-8 and 10-4-8 71 73 , for which a possible quasi-2D behavior 29 may also affect the angular dependence), and to probe signatures of crossband pairing, that could be present in these materials, as it has been recently proposed 74 .…”
Section: Discussionmentioning
confidence: 83%
“…It would be interesting to extend the present study to other FeSC families (e.g., 112 70 , 10-3-8 and 10-4-8 71 73 , for which a possible quasi-2D behavior 29 may also affect the angular dependence), and to probe signatures of crossband pairing, that could be present in these materials, as it has been recently proposed 74 .…”
Section: Discussionmentioning
confidence: 83%
“…In contrast with conventional BCS pairing, the Coulomb pairing interaction is independent of the electron and hole spins. There are four possible electron-hole pairings, corresponding to four superfluid condensates [37,38]. We introduce the temperature dependent normal and anomalous multiband Matsubara Green functions, with subband indices α and β,…”
Section: Methodsmentioning
confidence: 99%
“…where T τ is the time-ordering operator. These result in mean field equations for the gaps and the densities [37,38]:…”
Section: Methodsmentioning
confidence: 99%
“…A mean-field analysis of the interplay between cross-band and intraband pairing, with applications to iron-based superconductors, has been recently reported in Ref. [42], while the effects of fluctuations and pseudogaps in this complex configuration is still an open and computational demanding problem. However, the shallow Fermi surface pocket coupled to the deep band in these materials, corresponding to the band 2 in this paper, indeed plays a significant role for the realization of the two-band BCS-BEC crossover in FeSe superconductors [7].…”
Section: Formalismmentioning
confidence: 99%