Protection of Unconventional Superconductivity from Disorder.

Authors

Sofie Castro Holbæk, Morten H Christensen, Andreas Kreisel, Brian M Andersen

Published in

Physical review letters. Volume 137. Issue 13. Pages 136004. Sep 25, 2026.

Abstract

Unconventional superconductivity is a desirable state of matter due to its potential for high transition temperatures T_{c} and associated favorable superconducting properties. However, the sign-changing nature of the order parameter of unconventional superconductors renders their condensates fragile to disorder, an inevitability in real materials. We uncover the generic properties of electronic band structures and associated Bloch weights able to support robust unconventional superconductivity. We demonstrate this property in several case studies of the kagome and Lieb lattices, showing how unconventional superconductors exhibit unusually weak T_{c} suppression by disorder, despite featuring fully compensated sign-changing order parameters. We contrast these results with those for unconventional superconductivity on the square and honeycomb lattices, which are unable to protect the condensates from disorder. Finally, we discuss material candidates for which this effect may be realized.

PMID:
42854125
Bibliographic data and abstract were imported from PubMed on 10 Oct 2026.

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