Evolution of the specific-heat anomaly of the high-temperature superconductor YBa2Cu3O7 under influence of doping through application of pressure up to 10 GPa

Abstract

The evolution of the specific-heat anomaly in the overdoped range of a single crystal of the high-temperature superconductor YBa2Cu3O7 has been studied under influence of pressure up to 10 GPa, using AC calorimetry in a Bridgman-type pressure cell. We show that the specific-heat jump as well as the bulk Tc 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 doping dependence of the superconducting transition, as well as the evolution of the superconducting condensation energy on a single stoichometric sample without adding atomic disorder.

final version: J. Phys.: Condens. Matter 17 (2005) 4135-4145

References in corpus (3)

• Signatures of valence fluctuations in CeCu2Si2 under high pressure
• Phase fluctuations and the pseudogap in YBa2Cu3Ox
• Two Pseudogaps in the Cuprates: Meingast et al. Reply

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