Superfluid density of strongly underdoped cuprate superconductors from a four-dimensional XY model |
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Authors: | Franz M Iyengar A P |
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Affiliation: | Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada V6T 1Z1. |
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Abstract: | A new phenomenology is proposed for the superfluid density rhos of strongly underdoped cuprate superconductors based on recent data for ultraclean single crystals of YBa2Cu3O7-x. We show that the puzzling departure from Uemura scaling and the decline of the slope as the Tc=0 quantum critical point is approached can be understood in terms of the renormalization of quasiparticle effective charge by quantum fluctuations of the superconducting phase. We then employ a (3+1)-dimensional XY model to calculate, within particular approximations, the renormalization of rhos and its slope, explain the new phenomenology, and predict its eventual demise close to the quantum critical point. |
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