Physics – Condensed Matter – Superconductivity
Scientific paper
2005-04-27
PRL 96, 047007 (2006)
Physics
Condensed Matter
Superconductivity
Version published in PRL. For additional info and related work visit http://www.physics.ubc.ca/~franz
Scientific paper
10.1103/PhysRevLett.96.047007
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 T_c = 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.
Franz Marcel
Iyengar Andrew P.
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