SPECIFIC-HEAT OF SM1-XCU3OY SOLID-SOLUTION OF ORTHORHOMBIC AND TETRAGONAL STRUCTURE(XBA2)

The specific heats of Sm1+xBa2-xCu3Oy solid solution of orthorhombic a nd tetragonal structure were measured in the temperature range 80-300 K. The data were analyzed in the framework of the Debye model with dil atation correction. The tendency to lower the high-temperature limit o f the Debye temperature, THETA(D)HT, with the oxygen deficiency was no ticed. In contrast, the increase of Sm substitution causes a rise of T HETA(D)HT. The temperature dependence THETA(D)(T) was calculated for e ach compound from the series for the whole temperature region investig ated.