We analyze high precision, high resolution microcalorimetric specific heat data of detwinned YBa2Cu3O(7-delta) single crystals. It is shown that a finite size effect must be taken into account when attempting to extract critical properties. Contrary to previous claims, there is no contradiction to a regular second order phase transition. Consistency with 3D-XY critical behavior is demonstrated.
@article{arxiv.cond-mat/9911352,
title = {Finite size effect in the specific heat of YBa2Cu3O7-delta},
author = {T. Schneider and J. M. Singer},
journal= {arXiv preprint arXiv:cond-mat/9911352},
year = {2007}
}