Non-Temperature-Sensitive and Large Low-Field Magnetoresistance in Bonded Perovskite Manganite Composites

摘要

Perovskite manganite composites containing polymer binder (epoxy resin) and additional metal (Sn) were prepared using a novel bonded method. The magnetoresistance (MR) for the sample containing 4% polymer binder and 10% metal was as high as 20% and nonsensitive to temperature in the temperature range of 50-300 K under applied field of 3 kOe. The nontemperature-sensitive and large MR could be ascribed to the contribution of polymer and metal, respectively. When temperature was higher than 300 K, intrinsic colossal magnetoresistance effect was observed.