Charge/orbital ordering vs. Jahn-Teller distortion in

U. Staub; V. Scagnoli; A. M. Mulders; M. Janousch; Z. Honda; J. M. Tonnerre

doi:10.1209/epl/i2006-10343-x

All issues

Volume 76 / No 5 (December 2006)

Europhys. Lett., 76 5 (2006) 926-932

Abstract

Issue		Europhys. Lett. Volume 76, Number 5, December 2006


Page(s)		926 - 932
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2006-10343-x
Published online		01 November 2006

Europhys. Lett., 76 (5), pp. 926-932 (2006)

Charge/orbital ordering vs. Jahn-Teller distortion in $\chem{La_{0.5}Sr_{1.5}MnO_{4}}$

U. Staub¹, V. Scagnoli¹, A. M. Mulders¹, M. Janousch¹, Z. Honda² and J. M. Tonnerre³

¹ 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

Received: 23 February 2006
Accepted: 4 October 2006

Abstract

Temperature dependences of a magnetic and an orbital Bragg reflection at the Mn $L_{2,3}$ edges of $\chem{La_{0.5}Sr_{1.5}MnO_{4}}$ 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 $150\un{K}$ , 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

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