SOME PROPERTIES OF THE GIANT MAGNETORESISTANCE (GMR) MATERIAL LA-Y-CA-MN-O

Polycrystalline samples of La0.60Y0.07Ca0.33MnO3, which is an excellen t system for demonstrating giant negative magnetoresistance, have been studied in some detail at temperatures below 300 K and in applied mag netic fields between 0 and 5 T. A similar behaviour as reported by oth ers is observed. The most drastic effect occurs near 160 K, where the resitivity drops a factor of 60 when applying a field of 5 T. A study of the hysteresis effects in transport as well as magnetization has be en performed.