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

Rolf Lortz·Alain Junod·Didier Jaccard·Yuxing Wang·Christoph Meingast·Takahiko Masui·Setsuko Tajima
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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.

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Rolf Lortz, Alain Junod, Didier Jaccard, Yuxing Wang, Christoph Meingast, Takahiko Masui, Setsuko Tajima. 2005-06-28. Evolution of the specific-heat anomaly of the high-temperature superconductor YBa2Cu3O7 under influence of doping through application of pressure up to 10 GPa. https://doi.org/10.1088/0953-8984%2F17%2F26%2F012

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