Study on Extraordinary Transport Behaviors of Polycrystalline La-Sb-Mn-O Ceramic

Abstract:

The transport properties of polycrystalline La_0.9Sb_0.1MnO₃ (LSMO) bulk prepared by the solid-state reaction were investigated. We find that transport behaviors heavily depend on the synthesis process. The resistivity of LSMO1 for less rubbing time shows one metal-insulator transition (MIT) peak at temperature of 201 K, while the resistivity of LSMO2 for more rubbing time shows a MIT and a shoulder at about 240 and 140 K, respectively. The magnetoresistance (MR) ratio of LSMO2 reaches 41% under magnetic field of 2 T. Moreover, the MR ratio keeps significant value within broad temperature range. The infrared (IR) absorption spectra of LSMO2 show that the stretch-mode peak split into two Gaussian peaks with the gap about 70 cm^-1. This large splitting indicates there are strong distortion and disorder in LSMO2 sample. The results are interpreted in terms of the disorder system and phase separation in perovskite manganites.

• Periodical: Advanced Materials Research (Volume 746)
• Pages: 234-239
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.746.234
• Online since: August 2013
• Authors: Ping Duan, Wen Jing Duan, J.Y. Wang, Q. Wang, L. Chang, L. Kong
• Keywords: Colossal Magnetoresistance, Disorder, LSMO Ceramic, Transport Properties

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