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Calorimetric Studies of High Temperature Oxide Superconductors

Published online by Cambridge University Press:  28 February 2011

Yasutoshi Saito ,
Tetsurõ Nakamura  and
Tooru Atake
Yasutoshi Saito
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 227, Japan
Tetsurõ Nakamura
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 227, Japan
Tooru Atake
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 227, Japan
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Abstract

The heat capacities of single phase samples of Ba2DyCu3O7 and Ba2ErCu3O7 which were prepared by the method of powder-calcination have been measured over the temperature range 13–300 K by using a laboratory-made adiabatic calorimeter. A typical second-order type of anomaly was observed due to the superconducting phase transition at 92.5 K in Ba2DyCu3O7 and at 91.2 K in Ba2ErCu3O7. From the heat capacity jump at the transition temperature, the electronic heat capacity coefficient was estimated as 30 mJ·K-2.mol1 for Ba2ErCu3O7 and 32 mJ·K-2. mol-1 for Ba2ErCu3O7. Large differences were found in the low temperature heat capacities between the two samples, which were analyzed on the basis of Schottky-type of anomalies owing to the magnetic ions of Dy and Er.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 475
Copyright
Copyright © Materials Research Society 1988

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References

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