Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8153966 | Journal of Magnetism and Magnetic Materials | 2018 | 26 Pages |
Abstract
Structural, magnetic and magnetocaloric properties of the nanocrystalline La0.7Te0.3Mn0.7Co0.3O3 perovskite manganite were investigated. X-ray diffraction pattern indicated that the nanocrystalline sample crystallized in orthorhombic crystal structure with Pbnm space group. The average particle size was calculated using scanning electron microscope and it was found to be â¼150Â nm. Temperature dependence magnetization measurements revealed ferromagnetic-paramagnetic phase transition and the Curie temperature (TC) was found to be â¼201Â K. Field dependence magnetization showed the hysteresis at low temperature with a coercive field of â¼0.34Â T and linear dependence at high temperature corresponds to paramagnetic region. Based on the magnetic field dependence magnetization data, the maximum entropy change and relative cooling power (RCP) were estimated and the values were 1.002Â JÂ kgâ1Â Kâ1 and 90Â JÂ kgâ1 for a field change of 5Â T respectively. Temperature dependent resistivity Ï(T) data exhibited semiconducting-like behavior at high temperature and the electrical transport was well explained by Mott's variable-range hopping (VRH) conduction mechanism in the temperature range of 250Â K-300Â K. Using the VRH fit, the calculated hoping distance (Rh) at 300Â K was 54.4Â Ã
and density of states N(EF) at room temperature was 7.04Â ÃÂ 1018Â eVâ1Â cmâ3. These values were comparable to other semiconducting oxides.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Meenakshi Meenakshi, Amit Kumar, Rabindra Nath Mahato,