Raising the critical temperature by disorder in unconventional superconductors mediated by spin fluctuations

Abstract

We propose a mechanism whereby disorder can enhance the transition temperature Tc of an unconventional superconductor with pairing driven by exchange of spin fluctuations. The theory is based on a self-consistent real space treatment of pairing in the disordered one-band Hubbard model. It has been demonstrated before that impurities can enhance pairing by softening the spin fluctuations locally; here, we consider the competing effect of pair-breaking by the screened Coulomb potential also present. We show that, depending on the impurity potential strength and proximity to magnetic order, this mechanism results in a weakening of the disorder-dependent Tc-suppression rate expected from Abrikosov-Gor'kov theory, or even in disorder-generated Tc enhancements.

6 pages, 4 figures + Supplementary Material

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• Generalization of Anderson's Theorem for Disordered Superconductors
• Charge density wave and superconductivity competition in Lu${}_5$Ir${}_4$Si${}_{10}$ : a proton irradiation study
• Glass-induced enhancement of superconducting $T_c$: Pairing via dissipative mediators
• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• Cometal addition effect on superconducting properties and granular behaviours of polycrystalline FeSe0.5Te0.5
• Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr2VFeAsO3-delta, a superconductor
• Suppression of Superconductivity and Nematic Order in Fe${}_{1-y}$Se${}_{1-x}$S${}_x$ (0$\le$$x$$\le$1, $y$$\le$0.1) Crystals by Anion Height Disorder
• Two-Dimensional Phase-Fluctuating Superconductivity in Bulk-Crystalline NdO${}_{0.5}$F${}_{0.5}$BiS${}_2$
• The Low-Temperature Phenomenology of Gap Inhomogeneity in the Cuprate Superconductors: High-Energy Granularity, Low-Energy Homogeneity, and Spectral Kinks
• Correlations Among STM Observables in Disordered Unconventional Superconductors