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- W2092496619 abstract "Substitution of aliovalent diamagnetic ions with fixed valence states (Li+, Mg2+ and Ti4+) at the Mn site in LaMnO3 (LaMn1-xMxO3+δ) drastically decreases the room temperature resistivity (from ~368 to ~10 Ω cm). The concentration of Mn4+ ions increases with increase in diamagnetic addition. The presence of diamagnetic ions in LaMnO3 samples shows low values of δ (0-0.045) in comparison to LaMnO3+δ (δ = 0-0.26). Therefore, the cation vacancies (La, Mn) in the La and Mn sublattices will be much lower than that of LaMnO3+δ; consequently the scattering of holes at the vacancies will be reduced, resulting in lower resistivity. There is no transition to metallic state at low temperatures even for samples with large hole concentration as in the case of LaMn0.8Mg0.2O3+δ. However, there is a transition from the para- to ferromagnetic state. In resistivity characteristics, the high temperature region satisfies the small polaron model and the activation energy calculated is less than 0.3 eV. Thermopower measurements exhibit a change in behaviour at low temperatures, which is not observed in resistivity curves. Magnesium added samples (LaMn0.8Mg0.2O3+δ) show a large negative magnetoresistance (MR) coefficient (0.8) at low magnetic fields (H = 1 T) and the MR increases with Mg concentration (x = 0.05-0.2). Samples treated at low partial pressures of oxygen at 1050-1300 K display large variation in resistivity and MR due to the reduction in holes." @default.
- W2092496619 created "2016-06-24" @default.
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- W2092496619 date "2000-08-16" @default.
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- W2092496619 title "Electrical transport properties and magnetoresistance of LaMn<sub>1-<i>x</i></sub>M<sub><i>x</i></sub>O<sub>3+δ</sub>substituted with diamagnetic ions (M = Li, Mg, Ti)" @default.
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- W2092496619 doi "https://doi.org/10.1088/0953-8984/12/35/310" @default.
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