Identifying the dominant pairing interaction in high-Tc FeSe superconductors through Leggett modes
Wen Huang, Manfred Sigrist, Zheng-Yu Weng
DOI 10.1103/PhysRevB.97.144507 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Heavily electron-doped and single-layer FeSe superconduct at much higher temperatures than bulk FeSe. There have been a number of proposals attempting to explain the origin of the enhanced transition temperature, including the proximity to magnetic, nematic, and antiferro-orbital critical points, as well as possible strong interfacial phonon coupling in the case of single-layer FeSe. In this paper, we examine the effect of the various mechanisms in an effective two-band model. Within our model, the fluctuations associated with these instabilities contribute to different parts of the effective multiband interactions. We propose to use the collective phase fluctuation between the bands–the Leggett mode–as a tool to identify the dominant effective pairing interaction in these systems. The Leggett mode can be resolved by means of optical probes such as electronic Raman scattering. We point out that the Leggett mode in these systems, if present, shall manifest in the Raman B1g channel.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure unresolved | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
Similar papers
Identifying the dominant pairing interaction in high- FeSe superconductors through Leggett modes
similarity 0.96Wen Huang et al. · 2017 · arXiv:1704.00333
Source status unknown — claims are unverified
Effect of impurity substitution on band structure and mass renormalization of the correlated FeTe0.5Se0.5 superconductor
similarity 0.95S. Thirupathaiah et al.
Source status unknown — claims are unverified
Quantum chemical formulation of high-Tc superconductivity applied to α-FeSe
similarity 0.95Itai Panas
Source status unknown — claims are unverified
Superconductivity in FeSe: The Role of Nematic Order
similarity 0.95Jian Kang et al.
Source status unknown — claims are unverified
Robustness of superconductivity to competing magnetic phases in tetragonal FeS
similarity 0.95Franziska K. K. Kirschner et al.
Source status unknown — claims are unverified
Robustness of superconducting properties to transition metal substitution and impurity phases in Fe1−xVxSe
similarity 0.95Franziska K. K. Kirschner et al.
Source status unknown — claims are unverified