Physics – Condensed Matter – Superconductivity
Scientific paper
2005-03-22
J. Phys.: Condens. Matter 17 (2005) 4135-4145
Physics
Condensed Matter
Superconductivity
final version: J. Phys.: Condens. Matter 17 (2005) 4135-4145
Scientific paper
10.1088/0953-8984/17/26/012
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.
Jaccard Didier
Junod Alain
Lortz Rolf
Masui Takahiko
Meingast Christoph
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