Raising the Critical Temperature by Disorder in Unconventional Superconductors Mediated by Spin Fluctuations

Astrid T. Rømer; P. J. Hirschfeld; Brian M. Andersen

doi:10.1103/PhysRevLett.121.027002

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Raising the Critical Temperature by Disorder in Unconventional Superconductors Mediated by Spin Fluctuations

Astrid T. Rømer, P. J. Hirschfeld, Brian M. Andersen

DOI 10.1103/PhysRevLett.121.027002 · Physical Review Letters

T1

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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.

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.	—	Pressure not reported	unknown