Abstract
La 2/3Ca 1/3MnO 3 and Se 2FeMoO 6 nano-crystalline powders were pre-prepared using the polymer-network gel method, and the average grain sizes of La 2/3Ca 1/3MnO 3 and Se 2FeMoO 6 were about 40 and 50 nm, respectively. A series of La 2/3Ca 1/3MnO 3/Se 2FeMoO 6 nano-crystalline composites (molar ratio 1:1) were successfully synthesized under high pressure (4 GPa) and different treating temperatures. Due to the compositive influence of the smaller grain sizes, the Curie transition temperatures T C (∼225 K) for all composites are lower than that of the pure phase La 2/3Ca 1/3MnO 3. For the sample synthesized at the optimum conditions, the magnetoresistance value is close to 32% at 3 T and 5 K.
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