Abstract
We report heat capacity results obtained on single phase polycrystalline samples of high T c perovskite type superconductors YBa 2Cu 3O 7−x, EuBa 2Cu 3O 7−x, HoBa 2Cu 3O 7−x. The samples were obtained from the sintered product of well reacted A 2O 3, BaO 2 and Cuo powders. The calorimetric measurements were performed in a computer controlled continuous heating adiabatic calorimeter in the temperature range 77–300 K. The work is aimed to compare the thermal behaviour of compounds ABa 2Cu 3O 7−x in which elements with different internal magnetic field are present. Particularly a study at temperature above the superconducting transitions was compared with others, to investigate by calorimetric measurements thermal effects already observed in YBCO system by anelastic relaxation measurements at various temperatures.
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