Cooperative Jahn-Teller phase transition in LaMnO3 studied by X-ray absorption spectroscopy.
作者： M. C. Sánchez , G. Subías , J. García , J. Blasco
DOI: 10.1103/PHYSREVLETT.90.045503
关键词: Jahn–Teller effect 、 X-ray absorption fine structure 、 Octahedron 、 Tetragonal crystal system 、 Edge structure 、 Condensed matter physics 、 Phase transition 、 Potts model 、 Physics 、 X-ray absorption spectroscopy
摘要: The local structure of ${\mathrm{L}\mathrm{a}\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$ across the Jahn-Teller (JT) transition at ${T}_{\mathrm{J}\mathrm{T}}=750\text{ }\text{ }\mathrm{K}$ was studied by means x-ray absorption near edge and extended fine Mn $K$-edge. Our results indicate a similar electronic for atoms above below ${T}_{\mathrm{J}\mathrm{T}}$ dynamical tetragonal JT distortion $\mathrm{M}\mathrm{n}{\mathrm{O}}_{\mathrm{6}}$ octahedra ${T}_{\mathrm{J}\mathrm{T}}$. structural is originated ordering tetragonally distorted octahedra. entropy content analyzed within framework three-state Potts model with nearest neighbor antiferrodistortive coupling.
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