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Colossal magnetoresistance in doped manganites: A consequence of percolation and phase separation.
- Source :
-
Applied Physics Letters . 7/23/2001, Vol. 79 Issue 4. 3 Graphs. - Publication Year :
- 2001
-
Abstract
- We report measurements of the resistivity and magnetization of high-quality melt-processed La[sub 0.67]Ca[sub 0.33]MnO[sub 3] (LCM) and Sr-doped LCM materials that exhibit a sharp and enhanced metal–insulator transition (T[sub MI]) with significant colossal magnetoresistance (CMR) and two competing magnetic phases in the vicinity of T[sub MI]. Our results can well be explained using percolation in combination with the phase-separation scenario proposed for CMR. We propose that the spin polarization through grain boundaries and the enhanced grain connectivity between the ferromagnetic domains facilitate better percolation through a junction and filament-like resistor network. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MANGANITE
*MAGNETORESISTANCE
*PERCOLATION
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 79
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 4825992
- Full Text :
- https://doi.org/10.1063/1.1388158