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

doi:10.1063/1.125887

Enhanced room-temperature magnetoresistance in partially melted La_0.67Ca_0.33MnO₃ 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

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

We have performed magnetic and transport measurements on La_0.67Ca_0.33MnO₃ 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 language	English
Pages (from-to)	763-765
Number of pages	3
Journal	Applied Physics Letters
Volume	76
Issue number	6
DOIs	https://doi.org/10.1063/1.125887
Publication status	Published - 2000 Feb 7
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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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.",

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AU - Pradhan, A. K.

AU - Roul, B. K.

AU - Wen, J. G.

AU - Ren, Z. F.

AU - Muralidhar, M.

AU - Dutta, P.

AU - Sahu, D. R.

AU - Mohanty, S.

AU - Patro, P. K.

PY - 2000/2/7

Y1 - 2000/2/7

N2 - 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.

AB - 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.

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