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Title: Electrical, magnetic and thermal properties of selected perovskite oxides
Keywords: Perovskite oxides, Manganites, Magnetocaloric effect, Impedance, thermopower, cobaltites
Issue Date: 25-Jan-2013
Citation: APARNADEVI MINISANKAR (2013-01-25). Electrical, magnetic and thermal properties of selected perovskite oxides. ScholarBank@NUS Repository.
Abstract: Transition metal oxides exhibit an interesting variety of physical properties such as metal-insulator transition, coexistence of ferromagnetism and ferroelectricity, high Tc superconductivity, charge-orbital ordering, phase separation, etc due to a strong correlation between charge, spin and lattice degrees of freedom. Perovskites oxides have general formula ABO3, where A is a trivalent rare earth or divalent alkali earth and B is a 3d transition metal. By substituting a trivalent A site cation by a divalent cation, part of 3d transition metals on a B site changes their valence state. This has an influence on magnetic, electrical and structural properties, such that they can be effectively controlled by doping. Particularly, in Mn-based (manganites) and Co-based (cobaltites) perovskite oxides, a balance between these interactions leads to multiple colossal effects. This thesis investigates aspects like dc and ac magnetotransport, magnetocaloric and thermoelectric properties of selected manganites and cobaltites: Sm0.7-xLaxSr0.3MnO3, La0.7-xPrxCa0.3MnO3 and Pr0.5-xBixSr0.5CoO3.
Appears in Collections:Ph.D Theses (Open)

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