| Autor: |
Tooru Atake, Kazuya Mori, Yasutoshi Saito, Shoichi Takanabe, Yuzo Saeki, Hitoshi Kawaji |
| Rok vydání: |
1989 |
| Předmět: |
|
| Zdroj: |
Thermochimica Acta. 139:169-179 |
| ISSN: |
0040-6031 |
| DOI: |
10.1016/0040-6031(89)87020-0 |
| Popis: |
Heat capacity measurements have been made by adiabatic calorimetry between 7 and 300 K on the high temperature superconductor Ba 2 TmCu 3 O 7 , which was prepared by the method of powder calcination and characterized by X-ray powder diffraction, electrical resistivity and magnetic susceptibility measurements. An anomaly due to the superconducting phase transition has been observed at 90.9 K, with a heat capacity jump of 5.1 J K −1 mol −1 from which the electronic heat capacity coefficient is calculated as 39 mJ K −2 mol −1 in the weak-coupling limit of the Bardeen-Cooper-Schrief fer theory. Electrical resistivities have also been measured precisely under the same conditions as used in the calorimetry, i.e. on the same sample maintained at thermodynamic equilibrium. In the transition region, curves of both the heat capacity anomaly and the resistivity drop have been compared in detail. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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