Enhanced room-temperature magnetoresistance in partially melted La0.67Ca0.33MnO3 manganites

A. K. Pradhan, B. K. Roul, J. G. Wen, Z. F. Ren, M. Muralidhar, P. Dutta, D. R. Sahu, S. Mohanty, P. K. Patro

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Abstract

We have performed magnetic and transport measurements on La0.67Ca0.33MnO3 polycrystalline and partially melted samples. The magnetization and resistance decrease as sintering temperature is increased. The insulator-to-metal transition temperature is remarkably enhanced in the partially melted sample, enabling its possible applications at room temperature. The microscopic studies in melt samples show an excellent connectivity between grains, suggesting the enhancement of percolative transport by opening new conduction channels and the disappearance of magnetic phase boundary at elevated temperature by the ordering of Mn spins blocked at the grain boundary of sintered samples.

Original languageEnglish
Pages (from-to)763-765
Number of pages3
JournalApplied Physics Letters
Volume76
Issue number6
DOIs
Publication statusPublished - 2000 Feb 7

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Pradhan, A. K., Roul, B. K., Wen, J. G., Ren, Z. F., Muralidhar, M., Dutta, P., Sahu, D. R., Mohanty, S., & Patro, P. K. (2000). Enhanced room-temperature magnetoresistance in partially melted La0.67Ca0.33MnO3 manganites. Applied Physics Letters, 76(6), 763-765. https://doi.org/10.1063/1.125887