Pairing Mechanism in Hunds Metal Superconductors and the Universality of the Superconducting Gap to Critical Temperature Ratio

2018/05/31 by Tsung-Han Lee, Andrey Chubukov, Hu Miao +1 · 1 citation
Physics and Astronomy · #cond-mat.supr-con #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.121.187003

published as Phys. Rev. Lett. 121, 187003 (2018)

arxiv created 2018/10/25 · arxiv updated 2018/11/07

Abstract

We analyze a simple model containing the physical ingredients of a Hund's metal, the local spin fluctuations with power-law correlators, (Ω₀/|Ω|)^γ, with γ greater than one, interacting with electronic quasiparticles. While the critical temperature and the gap change significantly with varying parameters, the 2Δ_max/k_BT_c remains close to twice the BCS value in agreement with experimental observations in the iron-based superconductors (FeSC).

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• Pairing in quantum-critical systems: T_c, Δ, and their ratio

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