Two types of superconducting domes in unconventional superconductors

Abstract

Uncovering the origin of unconventional superconductivity is often plagued by the overwhelming material diversity with varying normal and superconducting (SC) properties. In this article, we deliver a comprehensive study of the SC properties and phase diagrams using multiple tunings (such as disorder, pressure or magnetic field in addition to doping and vice versa) across several families of unconventional superconductors, including the copper-oxides, heavy-fermions, organics and the recently discovered iron-pnictides, iron-chalcogenides, and oxybismuthides. We discover that all these families often possess two types of SC domes, with lower and higher superconducting transition temperatures Tc, both unconventional but with distinct SC and normal states properties. The lower Tc dome arises with or without a quantum critical point (QCP), and not always associated with a non-Fermi liquid (NFL) background. On the contrary, the higher-Tc dome clearly stems from a NFL or strange metal phase, without an apparent intervening phase transition or a QCP. The two domes appear either fully separated in the phase diagram, or merged into one, or arise independently owing to their respective normal state characteristics. Our findings suggest that a QCP-related mechanism is an unlikely scenario for the NFL phase in these materials, and thereby narrows the possibility towards short-range fluctuations of various degrees of freedom in the momentum and frequency space. We also find that NFL physics may be a generic route to higher-Tc superconductivity.

34 pages. Accepted in NJP. (v2) A table of materials showing 2 SC domes, and 1 dome is added at the end

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Cited by in corpus (14)

• Pressure-induced Reemergence of Superconductivity in Topological Kagome Metal CsV3Sb5
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• Flat band superconductivity in the square-octagon lattice
• Fermiology and Origin of Tc Enhancement in a Kagome Superconductor Cs(V1-xNbx)3Sb5
• Two-dome superconductivity in FeS induced by a Lifshitz transition
• Enhanced Seebeck coefficient through the magnetic fluctuations in Sr${}_2$Ru${}_{1-x}{M}_x$O${}_4$ ($M=$ Co, Mn)
• Bulk and surface Dirac states accompanied by two superconducting domes in FeSe-based superconductors
• Prediction of $f$-wave pairing symmetry in YBa${}_2$Cu${}_3$O${}_{6+x}$ cuprates
• Abnormal Normal State and Pressure-driven Reentrant Superconductivity in the Heavy $d$-electron Superconductor Rh${}_{17}$S${}_{15}$
• Double-dome Unconventional Superconductivity in Twisted Trilayer Graphene
• Novel attractive pairing interaction in strongly correlated superconductors
• Second Dome of Superconductivity in YBa${}_2$Cu${}_3$O${}_7$ at High Pressure
• Scale-invariance as the cause of the superconducting dome in the cuprates
• Orbital driven two-dome superconducting phases in multiorbital superconductors