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Ubiquity of Superconducting Domes in the Bardeen-Cooper-Schrieffer Theory with Finite-Range Potentials
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Connecticut, USA.
Number of Authors: 32019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 15, article id 157001Article in journal (Refereed) Published
Abstract [en]

Based on recent progress in mathematical physics, we present a reliable method to analytically solve the linearized Bardeen-Cooper-Schrieffer (BCS) gap equation for a large class of finite-range interaction potentials leading to s-wave superconductivity. With this analysis, we demonstrate that the monotonic growth of the superconducting critical temperature T-c with the carrier density n predicted by standard BCS theory, is an artifact of the simplifying assumption that the interaction is quasilocal. In contrast, we show that any well-defined nonlocal potential leads to a superconducting dome, i.e., a nonmonotonic T-c(n) exhibiting a maximum value at finite doping and going to zero for large n. This proves that, contrary to conventional wisdom, the presence of a superconducting dome is not necessarily an indication of competing orders, nor of exotic superconductivity.

Place, publisher, year, edition, pages
2019. Vol. 122, no 15, article id 157001
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-169118DOI: 10.1103/PhysRevLett.122.157001ISI: 000465182200011PubMedID: 31050533OAI: oai:DiVA.org:su-169118DiVA, id: diva2:1319967
Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-06-03Bibliographically approved

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Balatsky, Alexander V.
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