Singularity of the london penetration depth at quantum critical points in superconductors
Abstract
We present a general theory of the singularity in the London penetration depth at symmetry-breaking and topological quantum critical points within a superconducting phase. While the critical exponents and ratios of amplitudes on the two sides of the transition are universal, an overall sign depends upon the interplay between the critical theory and the underlying Fermi surface. We determine these features for critical points to spin density wave and nematic ordering, and for a topological transition between a superconductor with Z 2 fractionalization and a conventional superconductor. We note implications for recent measurements of the London penetration depth in BaFe2(As1-xPx)2. © 2013 American Physical Society.
Date Published
Journal
Physical Review Letters
Volume
111
Issue
15
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885609897&doi=10.1103%2fPhysRevLett.111.157004&partnerID=40&md5=e99fcb4de62294e6937b511b75e57f53
DOI
10.1103/PhysRevLett.111.157004
Research Area
Group (Lab)
Debanjan Chowdhury Group
Funding Source
1103860