Abstract
Local deviations from the average magnetic and atomic structure of La 0.67Ca 0.33MnO 3 are explored by combining neutron diffraction and reverse Monte Carlo techniques. Short range FM Mn–Mn spin pair correlations are found to be a majority well above T c, while AF correlations between first neighbour pairs of Mn ions develop preferentially around T c and within those pairs with a distance larger than the average first neighbour Mn–Mn distance. These results agree with the predictions of current theories on phase transitions in double exchange systems.
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