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Title: Composition dependence of giant magnetoresistance in La1-xCaxMnO3 (0.1 ≤ x ≤ 0.9)
Authors: Mahendiran, R
Mahesh, R
Raychaudhuri, A K
Rao, C N R
Keywords: Giant magnetoresistance
Perovskite oxides
giant magnetoresistance
Issue Date: May-1995
Publisher: Elsevier Science
Citation: Solid State Communications 94(7), 515–518 (1995)
Abstract: We have studied the resistivity (ρ) and the magnetoresistance (MR) in sintered samples of La1−xCaxMnO3 for 0.1≤x≤0.9 in the temperature range 4.2K≤T≤400K in magnetic fields H≤6T. We have observed giant negative magnetoresistance in the whole composition range, although the magnitude of MR depends on the level of doping, the peak in the magnitude of MR [(ρ(H)-ρ(0))/ρ(0)] at 6T being be as high as 90%. The magnitude of the MR generally increases as the temperature corresponding to the MR peak decreases. All the samples with x≤0.5 show a ferromagnetic transition with the temperature dependence of ρ showing a metallic behavior (dρ/dT>0) below the Curie temperature. The sample with x=0.9 shows insulating behavior over the entire temperature range but the MR shows a peak at low temperatures.
Description: Restricted Access
Other Identifiers: 0038-1098
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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