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- Title
Negative magnetoresistance in mixed-valence La[sub 0.6]Y[sub 0.1]Ca[sub 0.3]MnO[sub 3]: Evidence for charge localization governed by the Curie–Weiss law.
- Authors
Sergeenkov, S.; Bougrine, H.; Ausloos, M.; Gilabert, A.
- Abstract
The colossal negative magnetoresistance Δρ observed in La[sub 0.6]Y[sub 0.1]Ca[sub 0.3]MnO[sub 3] at B = 1 T shows an unusual, nearly perfect symmetry (around the peak temperature T[sub 0]=160K), suggestive of a Curie-Weiss-dominated transport mechanism in this material both above and below the field-dependent Curie temperature T[sub C]≡T[sub 0]. Attributing this symmetry to strong magnetic fluctuations below T[sub C] (which are triggered by the Y substitution and cause a "bootstrap" destruction of the ferromagnetic phase), the data are interpreted in terms of the nonthermal spin hopping and magnetization-dependent charge carrier localization scenario leading to Δρ=-ρ[sub s](1-e[sup -γM²]), with the magnetization M(T,B)=CB/\T-T[sub C](B)\[sup ν]. The separate fits through all the data points above and below T[sub C] yield C[sup +]...2C[sup -] and ν[sub +]...ν[sub -]...1, in agreement with the predictions of the Landau mean-field theory.
- Subjects
MAGNETORESISTANCE; PEROVSKITE; TRANSPORT theory
- Publication
JETP Letters, 1999, Vol 70, Issue 2, p141
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.568143