Superfluid density in cuprates: hints on gauge compositeness of the holes

Abstract

We show that several features (the three-dimensional XY universality for moderate underdoping, the almost-BCS behaviour for moderate overdoping and the critical exponent) of the superfluid density in hole-doped cuprates hint at a composite structure of the holes. This idea can be implemented in a spin-charge gauge approach to the $t-t^{\prime }-J$ model and provides indeed good agreement with available experimental data.

arXiv comment5 pages, 1 figure, to be published in the proceedings of the International Conference in Superconductivty and Magnetism ICSM2016

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