Abstract
The high-field magnetoresistance (HFMR) behavior of La 0.7 Sr 0.3 MnO 3 samples with grain size from 20 to 100 nm has been investigated. The HFMR behavior of the samples at low and room temperatures is remarkably different. The HFMR increases monotonously with the decrease of the grain size at low temperatures. On the contrary, the HFMR has a maximum with the grain size of D 70 nm at room temperature. The low-temperature HFMR originates from the existence of an intergrain Coulomb gap in addition to the tunnel barrier and the room temperature HFMR is ascribed to the existence of two different magnetic phases between interface and the intragrain.
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