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| Reference : Negative magnetoresistance in mixed-valence La0.6Y0.1Ca0.3MnO3: Evidence for charge loca... |
| Scientific journals : Article | |||
| Physical, chemical, mathematical & earth Sciences : Physics | |||
| http://hdl.handle.net/2268/74810 | |||
| Negative magnetoresistance in mixed-valence La0.6Y0.1Ca0.3MnO3: Evidence for charge localization governed by the Curie-Weiss law | |
| English | |
| Sergeenkov, S. [> > > >] | |
Bougrine, Hassan  [Université de Liège - ULg > CARE "Le Réseau des bibliothèques de l'ULg" > Bibliothèque des Sciences et Techniques >] | |
| Ausloos, Marcel [Université de Liège - ULg > Département de physique > Physique statistique appliquée et des matériaux - S.U.P.R.A.S. >] | |
| Gilabert, A. [> > > >] | |
| 1999 | |
| JETP Letters | |
| Springer Science & Business Media B.V. | |
| 70 | |
| 2 | |
| 141-146 | |
| International | |
| 0021-3640 | |
| [en] The colossal negative magnetoresistance Delta rho observed in La0.6Y0.1Ca0.3MnO3 at B=1 T shows an unusual, nearly perfect symmetry (around the peak temperature T-0=160 K), suggestive of a Curie-Weiss-dominated transport mechanism in this material both above and below the field-dependent Curie temperature T(C)equivalent to T-0. Attributing this symmetry to strong magnetic fluctuations below T-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 Delta rho=-rho(s)(1-e(-gamma M2)), with the magnetization M(T,B)=CB/\ T-T-C(B)\(nu). The separate fits through all the data points above and below T-C yield C(+)similar or equal to 2C(-) and nu(+)similar or equal to nu(-)similar or equal to 1, in agreement with the predictions of the Landau mean-field theory. (C) 1999 American Institute of Physics. [S0021-3640(99)01314-6]. | |
| Researchers | |
| http://hdl.handle.net/2268/74810 |
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