We analyze the magnetic excitations and the spin-mediated superconductivity in iron-based superconductors within a low energy model that operates in the band basis, but fully incorporates the orbital character of the spin excitations. We show how the orbital selectivity, encoded in our low energy description, simplifies substantially the analysis and allows for analytical treatments, while retaining all the main features of both spin excitations and gap functions computed using multiorbital models. Importantly, our analysis unveils the orbital matching between the hole and electron pockets as the key parameter to determine the momentum dependence and the hierarchy of the superconducting gaps, instead of the Fermi surface matching, as in the common nesting scenario.

The Role of Orbital Nesting in the Superconductivity of Iron-Based Superconductors / Fernández-Martín, Raquel; Calderón, María J.; Fanfarillo, Laura; Valenzuela, Belén. - In: CONDENSED MATTER. - ISSN 2410-3896. - 6:3(2021), pp. 1-18. [10.3390/condmat6030034]

The Role of Orbital Nesting in the Superconductivity of Iron-Based Superconductors

Fanfarillo, Laura
Membro del Collaboration group
;
2021

Abstract

We analyze the magnetic excitations and the spin-mediated superconductivity in iron-based superconductors within a low energy model that operates in the band basis, but fully incorporates the orbital character of the spin excitations. We show how the orbital selectivity, encoded in our low energy description, simplifies substantially the analysis and allows for analytical treatments, while retaining all the main features of both spin excitations and gap functions computed using multiorbital models. Importantly, our analysis unveils the orbital matching between the hole and electron pockets as the key parameter to determine the momentum dependence and the hierarchy of the superconducting gaps, instead of the Fermi surface matching, as in the common nesting scenario.
6
3
1
18
34
10.3390/condmat6030034
https://www.mdpi.com/2410-3896/6/3/34
https://arxiv.org/abs/2107.02825
Fernández-Martín, Raquel; Calderón, María J.; Fanfarillo, Laura; Valenzuela, Belén
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11767/124469
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