Effects of momentum-dependent quasiparticle renormalization on the gap structure of iron-based superconductors
| Autor: | Thomas Maier, Shinibali Bhattacharyya, Douglas J. Scalapino, Peter Hirschfeld |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Superconductivity FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Momentum Renormalization Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons Pairing Condensed Matter::Superconductivity 0103 physical sciences Quasiparticle Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Anisotropy Dimensionless quantity Spin-½ |
| Popis: | We discuss the influence of momentum-dependent correlations on the superconducting gap structure in iron-based superconductors. Within the weak coupling approach including self-energy effects at the one-loop spin-fluctuation level, we construct a dimensionless pairing strength functional which includes the effects of quasiparticle renormalization. The stationary solution of this equation determines the gap function at $T_c$. The resulting equations represent the simplest generalization of spin fluctuation pairing theory to include the effects of an anisotropic quasiparticle weight. We obtain good agreement with experimentally observed anisotropic gap structures in LiFeAs, indicating that the inclusion of quasiparticle renormalization effects in the existing weak-coupling theories can account for the observed anomalies in the gap structure of Fe-based superconductors. 11 pages, 6 figures |
| Databáze: | OpenAIRE |
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