Molecular pairing and fully gapped superconductivity in Yb-doped CeCoIn5

Onur Erten, Rebecca Flint, Piers Coleman

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The recent observation of fully gapped superconductivity in Yb doped CeCoIn5 poses a paradox, for the disappearance of nodes suggests that they are accidental, yet d-wave symmetry with protected nodes is well established by experiment. Here, we show that composite pairing provides a natural resolution: in this scenario, Yb doping drives a Lifshitz transition of the nodal Fermi surface, forming a fully gapped d-wave molecular superfluid of composite pairs. The T4 dependence of the penetration depth associated with the sound mode of this condensate is in accordance with observation.

Original languageEnglish (US)
Article number027002
JournalPhysical Review Letters
Volume114
Issue number2
DOIs
StatePublished - Jan 15 2015
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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