title: Electrical transport and giant magnetoresistance in La0.75Sr0.25Mn1-xCrxO3 (0.15, 0.20 and 0.25) manganite oxide.
abstract: We have investigated the influence of chromium (Cr) doping on the magneto-electrical properties of polycrystalline samples La0.75Sr0.25Mn1-xCrxO3 (0.15 ≤ x ≤ 0.25), prepared by the sol-gel method. Comparison of experimental data with the theoretical models shows that in the metal-ferromagnetic region, the electrical behavior of the three samples is quite well described by a theory based on electron-electron, electron-phonon and electron-magnon scattering and Kondo-like spin dependent scattering. For the high temperature paramagnetic insulating regime, the adiabatic small polaron hopping (SPH) model is found to fit well the experimental curves.
authors.affiliation: Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000, Tunisia. dhahri.ahmad@gmail.com.
authors.forename: Ah
authors.initials: A
authors.lastname: Dhahri
authors.forename: M
authors.initials: M
authors.lastname: Jemmali
authors.forename: E
authors.initials: E
authors.lastname: Dhahri
authors.forename: E K
authors.initials: EK
authors.lastname: Hlil