Wilkins, S. B. and Spencer, P. D. and Hatton, P. D. and Collins, S. P. and Roper, M. D. and Prabhakaran, D. and Boothroyd, A. T. (2003) 'Direct observation of orbital ordering in La0.5Sr1.5MnO4 using soft x-ray diffraction.', Physical review letters., 91 (16). p. 167205.
We report the first direct resonant soft x-ray scattering observations of orbital ordering. We have studied the low temperature phase of La0:5Sr1:5MnO4, a compound that displays charge and orbital ordering. Previous claims of orbital ordering in such materials have relied on observations at the manganese K edge. These claims have been questioned in several theoretical studies. Instead we have employed resonant soft x-ray scattering at the manganese LIII and LII edges which probes the orbital ordering directly. Energy scans at constant wave vector are compared to theoretical predictions and suggest that at all temperatures there are two separate contributions to the scattering: direct orbital ordering and strong cooperative Jahn-Teller distortions of the Mn3 ions.
|Keywords:||Magnetic order, Manganites, Scattering, Charge, Lamn03.|
|Full text:||(VoR) Version of Record|
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|Publisher Web site:||http://dx.doi.org/10.1103/PhysRevLett.91.167205|
|Publisher statement:||© 2003 by The American Physical Society. All rights reserved.|
|Record Created:||09 Jan 2009|
|Last Modified:||13 Sep 2010 14:15|
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