Volume 76, Number 5, December 2006
|Page(s)||926 - 932|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2006|
Charge/orbital ordering vs. Jahn-Teller distortion in
Swiss Light Source, Paul Scherrer Institut - 5232 Villigen PSI, Switzerland
2 Department of Functional Materials Science, Saitama University Shimo-Ohkubo 255, Saitama, 338-8570, Japan
3 Laboratoire de Cristallographie, CNRS - 38042 Grenoble, France
Accepted: 4 October 2006
Temperature dependences of a magnetic and an orbital Bragg reflection at the Mn edges of have been collected. The temperature evolution of the orbital reflection depends strongly on the X-ray energy and reflects the different order parameters, which are assigned to orbitals and Jahn-Teller distortions. The Jahn-Teller order parameter saturates at , whereas the orbital order parameter gradually increases. These results are discussed in context with the possible driving forces, the orbital-orbital super exchange and the Jahn-Teller strain field interaction.
PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 71.30.+h – Metal-insulator transitions and other electronic transitions / 75.47.Lx – Manganites
© EDP Sciences, 2006
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