Electronic, structural and magnetic phase diagram of Sm1-xSrxMnO3 manganites

Abstract

The electronic, structural and magnetic phase diagram of the colossal magnetoresistive Sm1−xSrxMnO3 (0.16≤х≤0.67) manganites is constructed on the basis of their systematic studies by high-resolution neutron powder diffraction. It is shown the tendency of researched system to formation of the phase-separated states on crystallographic as well as, in the even greater extent, on magnetic level. A clear correlation between fine specific features and temperature evolution of crystal structures, spin ordering of the manganese ions, and the physical properties of the samarium–strontium series of manganites obtained from temperature magnetic and transport measurements is demonstrated. It was found that ground state of Sm–Sr manganites shows very various physical properties depending first of all on the doping level х and, for given х, determined by two distortion parameters, namely, the average A-cation size <rA> and the local A-cation size mismatch σ2.