Effect of ionic size on the orbital ordering transition in RMnO3+δ

Details Effect of ionic size on the orbital ordering transition in RMnO3+δ Effect of ionic size on the orbital ordering transition in RMnO3+δ

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004njph....6..153m&link_type=abstract

New Journal of Physics, Volume 6, Issue 1, pp. 153 (2004).

Physics

10

Scientific paper

We present high-temperature powder x-ray diffraction data of the orbital-order-induced structural distortion of RMnO3, with R a rare earth element. The associated phase transition takes place in a temperature interval of ap200 K in which the orbitally ordered phase and the orbitally disordered phase coexist. We analyse the evolution of the RMnO3 perovskite structure with the size of the rare-earth ion and with temperature. We show that the rotation of the MnO6 octahedra stabilizes the cooperative Jahn Teller distortion to higher temperature.

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