Thermodynamic transitions in inhomogeneous cuprate superconductors
Abstract
Scanning tunneling spectroscopy studies on Bi2Sr2CaCu2O8+δ suggest the presence of electronic inhomogeneity with a large spatial variation in gap size. Andersen et al have modelled this variation by assuming a spatially-varying pairing interaction. We show that their calculated specific heat is incompatible with the experimental data which exhibit narrow transitions. This calls into question the now-common assumption of gap and pairing inhomogeneity.
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