Abstract
Sm0.5−xPrxSr0.5MnO3 exhibits a varietyof ground states as x is varied from 0 to 0.5. At an intermediate doping ofx = 0.3 a charge-ordered CE-type antiferromagnetic insulating (AFI) ground state is seen. Thetransition to this ground state is from a paramagnetic-insulating (PMI) phase through aferromagnetic-metallic phase (FMM). Local structures in PMI and AFI phases of thex = 0.3 sample have been investigated using Pr K-edge and Sm K-edge extended x-rayabsorption fine structure (EXAFS). It can be seen that the tilting and rotation of theMnO6 octahedraabout the b-axis are responsible for the charge-ordered CE-type antiferromagnetic ground state at lowtemperatures. In addition a shift in the position of the rare-earth ion along thec-axis has to be considered to account for observed distribution of bond distances aroundthe rare-earth ion.
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