La Sr MnO (LSMO)-BaTiO (BTO) nanocomposites have been synthesized by adding different amounts of BTO 0.7 0.3 3 3 using the sol-gel method. The structural analysis confirms that both phases coexist in the composite samples with the rhombohedral and tetragonal structure for LSMO and BTO, respectively. The magnetization measurement shows a decrease in magnetization with the increase in BTO concentration and a signature of the spin glass-like characteristics of the nanocomposite. The dielectric behavior indicates the existence of the magneto-electric coupling between LSMO and BTO phase. The measurement of transport properties shows that resistivity increases with BTO concentration and metal-insulator (M-I) transition temperature shifts towards lower temperature. The low-temperature (T< 50 K) resistivity behavior of the samples is analyzed by using the Kondo-like transport model. The results show the spin-disordered scattering increases with the increase in the amount of BTO in LSMO phase. The low-field magnetoresistance (LFMR) of the nanocomposite is improved as compared to the pure LSMO. The highest value of LFMR achieved for LSMO-BTO composite at 10 K is 35.5% with a 1 T magnetic field. Keywords Nanocomposite · M-I transition · Kondo-like transport 1 Introduction observed near the Curie temperature. The extrinsic CMR is related to
Journal of Superconductivity and Novel Magnetism – Springer Journals
Published: Jun 1, 2018
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