2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/29958We 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.5 pages, 4 figuresSuperconductivityStatistical Mechanicstext