An effective medium model applied to the conductivity of La-Ca-Mn-O across the phase transition temperature
SCIE
SCOPUS
- Title
- An effective medium model applied to the conductivity of La-Ca-Mn-O across the phase transition temperature
- Authors
- Song, H; Kim, WJ; Kwon, SJ
- Date Issued
- 2000-04
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- Colossal magnetoresistance is closely related to (bur is not) the abrupt change of electrical resistivity in the vicinity of Curie temperature, which is caused by the temperature-dependent paramagnetic-ferromagnetic phase transition and concurrent change of electrical conducting mechanism. A model equation based on the effective medium theory is presented to explain the abrupt change of resistivity in the vicinity of Curie temperature of La-Ca-Mn-O (LCMO). II is assumed that LCMO is in the form of mixture of ferromagnetic and paramagnetic phase in the magnetic transition region. The main ingredients of the equation are a simple effective medium theory and a Function For thr temperature-dependent fraction of ferromagnetic phase. This model fits very well to the measured resistance-temperature curves of La0.7Ca0.3MnO3. (C) 2000 Elsevier Science B.V. All rights reserved.
- Keywords
- effective medium model; magnetic phase transition; colossal magnetoresistance; manganese oxide; COLOSSAL-MAGNETORESISTANCE; MANGANESE OXIDES; FILMS; RESISTIVITY; LA0.7CA0.3MNO3; MANGANITES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21033
- DOI
- 10.1016/S0304-8853(99)00568-5
- ISSN
- 0304-8853
- Article Type
- Article
- Citation
- JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 213, no. 1-2, page. 126 - 134, 2000-04
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