Nanostructured systems which exhibits a fairly large magnetoresistance near room temperature

C Doroftei; E. Rezlescu; N. Rezlescu; P. D. Popa

doi:10.1117/12.823645

7 January 2009 Nanostructured systems which exhibits a fairly large magnetoresistance near room temperature

C Doroftei, E. Rezlescu, N. Rezlescu, P. D. Popa

Proceedings Volume 7297, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IV; 72970Y (2009) https://doi.org/10.1117/12.823645
Event: Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IV, 2008, Constanta, Romania

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_0.6Pb _0.4MnO₃. The structure and magnetotransport properties of the polycrystalline manganites La_0.6Pb_0.4MnO₃, La_0.6Pb_0.2Ca_0.2MnO₃ and La_0.6Pb_0.4Ca_0.2MnO₃ prepared by sol-gel self-combustion and heat treatment at 1000^oC 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_0.6 Pb_0.4 Ca_0.2MnO₃, 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.

Citation Download Citation

C Doroftei, E. Rezlescu, N. Rezlescu, and P. D. Popa "Nanostructured systems which exhibits a fairly large magnetoresistance near room temperature", Proc. SPIE 7297, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IV, 72970Y (7 January 2009); https://doi.org/10.1117/12.823645

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