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 superfuid 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'- J model and provides indeed good agreement with available experimental data.
Superfluid Density in Cuprates: Hints on Gauge Compositeness of the Holes
MARCHETTI, PIERALBERTO;BIGHIN, GIACOMO
2016
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 superfuid 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'- J model and provides indeed good agreement with available experimental data.
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