Heuristic bounds on superconductivity and how to exceed them
Abstract
What limits the value of the superconducting transition temperature (Tc) is a question of great fundamental and practical importance. Various heuristic upper bounds on Tc have been proposed, expressed as fractions of the Fermi temperature, TF, the zero-temperature superfluid stiffness, ρs(0), or a characteristic Debye frequency, ω0. We show that while these bounds are physically motivated and are certainly useful in many relevant situations, none of them serve as a fundamental bound on Tc. To demonstrate this, we provide explicit models where Tc/TF (with an appropriately defined TF), Tc/ρs(0), and Tc/ω0 are unbounded. © 2022, The Author(s).
Date Published
Journal
npj Quantum Materials
Volume
7
Issue
1
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85137200187&doi=10.1038%2fs41535-022-00491-1&partnerID=40&md5=95f30668fea21869c11fb2946149e1db
DOI
10.1038/s41535-022-00491-1
Research Area
Group (Lab)
Debanjan Chowdhury Group
Funding Source
DMR2000987
817799