Magnetotransport of La0.5Ba0.5MnO3

Pękała, M.; Drozd, Vadym; Fagnard, Jean-François; Vanderbemden, Philippe; Ausloos, Marcel

doi:10.1063/1.3032326

Cited by 18 publications

(2 citation statements)

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“…8 For the lacunars samples (x ¼ 0.10 and 0.20), we can use the scattering mechanisms model only for a short range below the metal-insulator transition temperature T q where these materials are characterized by a metallic behavior (dq/dT > 0). Unfortunately, the small polaron hopping mechanism and scattering one (Eqs.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Ca-deficiency on the magneto-transport properties in La0.8Ca0.2MnO3 perovskite and estimation of magnetic entropy change

Khlifi

Bejar

Dhahri

et al. 2012

Journal of Applied Physics

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La 0.8 Ca 0.2 À x h x MnO 3 (x ¼ 0.00, 0.10, and 0.20) perovskite was prepared by the conventional solid-state reaction and annealed at 1473 K. X-ray diffraction and scanning electron microscopy shown the existence of a secondary phase attributed to the unreacted Mn 3 O 4 oxide. The magneto transport properties have been investigated based on the temperature dependence of the resistivity q(T) measurements under several applied magnetic fields. We note that the La 0.8 Ca 0.2 MnO 3 (x ¼ 0.00) sample has a classical metal-insulator transition at T q . But we have observed that the lacunars samples (x ¼ 0.10 and 0.20) include a metallic and insulator behavior simultaneously below T q and the resistivity is dominated by tunneling through the barriers associated with the insulating phase. In other words, the calcium deficiency favors the enhancement of the insulator behavior. The electrical resistivity is fitted with the phenomenological percolation model, which is based on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions. Furthermore, we found that the estimated results are in good agreement with experimental data. Above all, the resistivity dependence on the temperature and magnetic field data is used to deduce the magnetic entropy change. We have found that these magnetic entropy change values are similar to those calculated in our previous work from the magnetic measurements. Finally, we have found an excellent estimation of the magnetic entropy change based on the Landau theory.

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Section: Resultsmentioning

confidence: 99%

“…The metallic behavior is usually described in terms of electron scattering process and electron-phonon interaction. 8 On the other hand, in the insulator state the carriers are localized as small polarons due to a strong Jahn Teller (JT) distortion. In this state, the electrical conduction is governed by small polaron hopping mechanism.…”

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confidence: 99%