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Enhanced metal-insulator transition and magnetoresistance in melt-processed La[sub 0.67]Ca[sub 0.33]MnO[sub 3] and Ho-doped manganites.
- Source :
-
Applied Physics Letters . 3/12/2001, Vol. 78 Issue 11, p1598. 3p. 2 Diagrams, 2 Graphs. - Publication Year :
- 2001
-
Abstract
- We report significant enhancement of magnetoresistance (MR) in melt-processed La[sub 0.67]Ca[sub 0.33]MnO[sub 3] (LCM) and in Ho-doped LCM samples. The LCM system exhibits surprising enhancement of metal-insulator transition (T[sub IM]) that coincides with the Curie transition temperature (T[sub c]), T[sub IM]approx. T[sub c], illustrating the enhanced percolative transport and spin-polarization through grain boundaries. Surprisingly, 1 mol % of addition of Ho enhances T[sub c] of ∼70 K with remarkable colossal MR. The nanoscale Ho distribution is consistent with the magnetic inhomogeneity-induced MR due to phase segregation in Ho-doped sample whereas charge-segregation picture is valid for undoped LCM. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 78
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 4715090
- Full Text :
- https://doi.org/10.1063/1.1354659