Low-temperature resistivity minima in colossal magnetoresistive La0.7Ca0.3MnO3 thin films

D. Kumar, J. Sankar, J. Narayan, Rajiv K. Singh, A. K. Majumdar

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The low-temperature magnetoresistance of La0.7Ca0.3MnO3 (LCMO) thin films has been investigated using a four-probe dc technique with a 5 T superconducting magnet. Thin film samples of LCMO were prepared in situ using a pulsed laser deposition technique. The results obtained from the high-resolution low-temperature (5-50 K) measurements, carried out on various samples differing widely in their resistivities, have shown distinct minima at Tm in the resistivity versus temperature plots for all fields. The depth of the resistance minima was found to increase with an increase in applied magnetic field H, while Tm versus H curves showed maxima at around 2 T. We have fitted the resistivity versus temperature data for all H to an expression that contains three terms, namely, residual resistivity, inelastic scattering, and electron-electron (e-e) interaction and Kondo effects. We conclude that the e-e interaction effect is the dominant mechanism for the negative temperature coefficient of resistivity of these colossal magnetoresistance (CMR) materials at low temperatures.

Original languageEnglish
Article number094407
Pages (from-to)944071-944076
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
StatePublished - 1 Mar 2002
Externally publishedYes


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