Abstract
The local and intermediate structure of La 1 - x Ca x MnO 3 has been studied in the orthorhombic (O) and pseudo-cubic ( O ′ ) phases, both as a function of temperature ( x = 0.00 ) , and as a function of Ca content (at 310 K). Neutron powder diffraction-based high real space resolution atomic pair distribution function (PDF) analysis shows that the Jahn Teller distortion of the MnO 6 octahedra persists locally deep in the O ′ phase in both cases studied, contrary to the average crystallographic view. The O to O ′ structural phase transformation does have a local structural signature evidenced as a dramatic change in a PDF peak at 10.3 Å sensitive to the rotations of the MnO 6 octahedra, providing further evidence that the nature of the transformation is orbital order to disorder regardless of whether the phase boundary is crossed as a function of T or x.
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