Unconventional disorder effects in correlated superconductors

Abstract

The understanding of disorder has profoundly influenced the development of condensed matter physics, explaining such fundamental effects as, for example, the transition from ballistic to diffusive propagation, and the presence of quantized steps in the quantum Hall effect. For superconductors, the response to disorder reveals crucial information about the internal gap symmetries of the condensate, and thereby the pairing mechanism itself. The destruction of superconductivity by disorder is traditionally described by Abrikosov-Gor'kov (AG) theory, which however ignores spatial modulations and ceases to be valid when impurities interfere, and interactions become important. Here we study the effects of disorder on unconventional superconductors in the presence of correlations, and explore a completely different disorder paradigm dominated by strong deviations from standard AG theory due to generation of local bound states and cooperative impurity behavior driven by Coulomb interactions. Specifically we explain under which circumstances magnetic disorder acts as a strong poison destroying high-Tc superconductivity at the sub-1% level, and when non-magnetic disorder, counter-intuitively, hardly affects the unconventional superconducting state while concomitantly inducing an inhomogeneous full-volume magnetic phase. Recent experimental studies of Fe-based superconductors have discovered that such unusual disorder behavior seem to be indeed present in those systems.

arXiv comment6 pages, 5 figures, and Supplementary material

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• Enhancing Superconductivity by Disorder
• Robust parity-mixed superconductivity in disordered monolayer transition metal dichalcogenides
• Unconventional superconductivity protected from disorder on the kagome lattice
• Heat capacity double transitions in time-reversal symmetry broken superconductors
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• Theoretical study of impurity-induced magnetism in FeSe
• Supercurrents and spontaneous time-reversal symmetry breaking by nonmagnetic disorder in unconventional superconductors
• Raising the critical temperature by disorder in unconventional superconductors mediated by spin fluctuations
• Revisiting superconductivity in the extended one-band Hubbard model: pairing via spin and charge fluctuations
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• Iron-based superconductors: tales from the nuclei
• Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors
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• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• Effective pairing theory for strongly correlated d-wave superconductors
• Role of magnetic dopants in the phase diagram of Sm1111 pnictides: The Mn case
• Stoichiometric FeTe is a Superconductor
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• Hole doping and electronic correlations in Cr-substituted BaFe${}_2$As${}_2$
• Effect of Mn Substitution on Superconductivity in PrFeAs(O,F): Role of Magnetic Impurities
• Directional Localization in Disordered 2D Tight-Binding Systems: Insights from Single Particle Entanglement Measures
• Enhancing long-range order in disordered two-band s-wave superconductors
• Emergence of novel magnetic order at finite temperature in overdoped pnictides
• Nematicity in LaFeAsO single crystals studied by elastoresistance, high-resolution thermal expansion and shear-modulus measurements