Abstract
Perovskite manganites display unusual correlations between magnetic, electronic, and structural properties that are caused by strong electron-electron and electron-phonon interactions. In this paper we discuss spectacular magneto-related structural, resistive, and thermo-caloric properties originating from magnetic, orbital, and charge ordering. Detailed neutron diffraction, striction, and magnetic measurements demonstrate a wealth of novel behavior observed for these compounds: the structural transformation induced by ferromagnetic transition, the structural transformation induced at fixed temperature by application of magnetic field, and the large mag-netocaloric and colossal magnetoresistive effects observed near the coupled ferromagnetic and metal-insulator transitions. Detailed study of the complex synthesis-structure-property relationships allows control of several of new properties and promises fascinating possibilities for technological applications of manganites as sensitive sensors of magnetic field, and working materials in magnetic refrigeration.
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