Multidome superconductivity in charge density wave kagome metals
Yu-Ping Lin, Rahul M. Nandkishore
DOI 10.1103/PhysRevB.106.L060507 · Physical Review B
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Abstract
Motivated by recent experiments on the kagome metals AV3Sb5 with A=K, Rb, and Cs, which show a charge density wave (CDW) at ∼100 K and superconductivity at ∼1 K, we explore the onset of the superconductivity, taking the perspective that it descends from a parent CDW. We argue that viewing the superconductivity as a weak-coupling instability of a reconstructed (by the CDW) Fermi surface naturally explains the experimentally observed “multidome” nonmonotonic dependence on pressure, with the “peaks” in the superconducting critical temperature being associated with the Van Hove singularities of the reconstructed Fermi surface. This “parent-child relationship” also naturally explains the large separation of energy scales between the superconductivity and the CDW. We discuss different possible pairing mechanisms and speculate that the CDW or reconstructed Pomeranchuk fluctuations may mediate the pairing interaction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
| RbV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
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