MAGNETOCALORIC EFFECT IN LA0.67CA0.33MNO-DELTA AND LA0.60Y0.07CA0.33MNO-DELTA BULK MATERIALS

The dependence of magnetization on the applied magnetic field and temp erature was measured carefully near their Curie temperatures for two p erovskite manganite samples: La0.67Ca0.33MnOdelta and La0.60Y0.07Ca0.3 3MnOdelta. Iris suggested by the results that these materials can be u tilized as both the thermal storage (passive regeneration) and as the working material (active regeneration) in an active magnetic regenerat ive refrigerator with very large temperature span, for their significa nt entropy change upon the application of a magnetic field and the eas ily tuned Curie temperatures. (C) 1996 American Institute of Physics.