Local atomic and electronic structure in LaMnO_3 across the orbital ordering transition

Abstract

The local atomic disorder and the electronic structure in the environment of manganese atoms in LaMnO_3 has been studied by x-ray absorption spectroscopy, over a temperature range (300K to 870K) covering the orbital ordering transition (710K). The Mn-O distances splitting into short and long bonds (1.95 and 2.15A) is kept across the transition temperature, so that the MnO_6 octahedra remain locally Jahn-Teller distorted. Discontinuities in the Mn local structure are identified in the extended x-ray fine structure spectra at this temperature, associated to a reduction of the disorder in the super-exchange angle and to the removal of the anisotropy in the radial disorder within the coordination shell. Subtle changes in the electronic local structure also take place at the Mn site at the transition temperature. The near edge spectra show a small drop of the Mn 4p hole count and a small enhancement in the pre-edge structures at the transition temperature. These features are associated to an increase of the covalence of the Mn-O bonds. Our results shed light on the local electronic and structural phenomena in a model of order-disorder transition, where the cooperative distortion is overcome by the thermal disorder.

arXiv comment6 pages, 6 figures, accepted Phys. Rev B

References in corpus (6)

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• Local structure study of the orbital order/disorder transition in LaMnO${}_3$
• Bandwidth-driven nature of the pressure-induced metal state of LaMnO3
• Lattice dynamics of ASb2O6 (A=Cu,Co) with trirutile structure
• Emergence of ferromagnetism and Jahn-Teller distortion in low Cr-substituted LaMnO3
• ESR evidence for partial melting of the orbital order in LaMnO${}_3$ below the Jahn-Teller transition