2005/04/30 by Marcel Franz, M. Franz, Andrew Iyengar +1 · 3 citations
Engineering · Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.96.047007
published as PRL 96, 047007 (2006) · Version published in PRL. For additional info and related work visit http://www.physics.ubc.ca/~franz
openalex publication_date 2006/02/03 · arxiv created 2006/02/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A new phenomenology is proposed for the superfluid density of strongly underdoped cuprate superconductors based on recent data for ultra-clean single crystals of YBCO. The data feature a puzzling departure from Uemura scaling and a decline of the slope as the Tc = 0 quantum critical point is approached. We show that this behavior can be understood in terms of the renormalization of quasiparticle effective charge by quantum fluctuations of the superconducting phase as described by a (3+1)-dimensional XY model. We calculate the renormalization of the superfluid density and its slope, explain the new phenomenology, and predict its eventual demise close to the QCP.