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- W2040247009 abstract "In this paper we focus on a less-studied system La-Pb-Ca-Mn-O perovskite like manganite. Ca was introduced as partial substituent for Pb or as additive to the parent composition La<sub>0.6 </sub>Pb <sub>0.4</sub>MnO<sub>3</sub>. The structure and magnetotransport properties of the polycrystalline manganites La<sub>0.6</sub>Pb<sub>0.4</sub>MnO<sub>3</sub>, La<sub>0.6</sub>Pb<sub>0.2</sub>Ca<sub>0.2</sub>MnO<sub>3</sub> and La<sub>0.6</sub>Pb<sub>0.4</sub>Ca<sub>0.2</sub>MnO<sub>3</sub> prepared by sol-gel self-combustion and heat treatment at 1000<sup>o</sup>C for 40 and 320 min were investigated. Measurements have been carried out in the temperature range 87 - 393 K on bulk samples. All manganites exhibit a peak in the resistivity around 175 - 225 K, well below TC (310 - 330 K). Magnetoresistance MR is negative, increases with decreasing temperature and exhibits a maximum at low temperature, 92 - 130 K, below the electrical transition temperature. Magnitude of MR at the peaks can attain 35% for Ca addition sample, La<sub>0.6</sub> Pb<sub>0.4</sub> Ca<sub>0.2</sub>MnO<sub>3</sub>, which has the largest resistivity. At room temperature, a smaller MR effect, of about 10%, is obtained. A longer heat treatment does not enhance the magnetoresistance at room temperature." @default.
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- W2040247009 date "2009-01-05" @default.
- W2040247009 modified "2023-09-23" @default.
- W2040247009 title "Nanostructured systems which exhibits a fairly large magnetoresistance near room temperature" @default.
- W2040247009 doi "https://doi.org/10.1117/12.823645" @default.
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