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

Condensed Matter

Laura Fanfarillo¹  Raquel Fernández-Martín²  María J. Calderón²  Belén Valenzuela² 

[1] Department of Physics, University of Florida, Gainesville, FL 32611, USA;Instituto de Ciencia de Materiales de Madrid, ICMM-CSIC, Cantoblanco, 28049 Madrid, Spain;

关键词: iron-based superconductors;    low energy model;    magnetism;    spin-mediated superconductivity;    orbital nesting;   

DOI  :  10.3390/condmat6030034

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown