Abstract
The evolution of the specific-heat anomaly in the overdopedrange of a single crystal of the high-temperature superconductorYBa2Cu3O7 has been studied under the influence of pressure up to 10 GPa, using AC calorimetry in aBridgman-type pressure cell. We show that the specific-heat jump as well as the bulkTc are reduced with increasing pressure in accordance with a simple charge-transfer model.This new method enables us through pressure-induced charge transfer to study the dopingdependence of the superconducting transition, as well as the evolution of thesuperconducting condensation energy on a single stoichiometric sample without addingatomic disorder.
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