Journal
MATERIALS RESEARCH BULLETIN
Volume 125, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2020.110813
Keywords
Manganites; Ferromagnetism; Curie temperature; Magnetoresistance
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Funding
- CSIR, New Delhi [09/100(0189)/2015-EMR-I]
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The influence of A-site cation disorder of monovalent alkali ions on structural and magneto-transport properties of colossal magnetoresistive (CMR) materials has been reported. All the compounds crystallize in Pbnm space group with orthorhombic symmetry. At low temperature, the samples exhibit a paramagnetic (PM) to ferromagnetic (FM) transition and a semiconductor to metallic one. The variation in both Curie temperature (T-c) and metal-semiconductor transition temperature (T-MS) can be explained by the change in Mn4+ content and average A-site cation radius. A decrease in resistivity in the vicinity of T-MS has been observed with an increase in the applied magnetic field. The values of T-c are dose to T-MS, signifying strong correlations between the magnetic and electrical properties. The electrical resistivity data in paramagnetic-semiconducting region (T > T-MS) may be described by the adiabatic small polaron hopping (ASPH) model. Maximum magnetoresistance (MR%) has been observed in the vicinity of T-MS.
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