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Direct observation of orbital ordering in La0.5Sr1.5MnO4 using soft x-ray diffraction.

By S. B. Wilkins, P. D. Spencer, P. D. Hatton, S. P. Collins, M. D. Roper, D. Prabhakaran and A. T. Boothroyd


We report the first direct resonant soft x-ray scattering observations of orbital ordering. We have\ud studied the low temperature phase of La0:5Sr1:5MnO4, a compound that displays charge and orbital\ud ordering. Previous claims of orbital ordering in such materials have relied on observations at the\ud manganese K edge. These claims have been questioned in several theoretical studies. Instead we have\ud employed resonant soft x-ray scattering at the manganese LIII and LII edges which probes the orbital\ud ordering directly. Energy scans at constant wave vector are compared to theoretical predictions and\ud suggest that at all temperatures there are two separate contributions to the scattering: direct orbital\ud ordering and strong cooperative Jahn-Teller distortions of the Mn3 ions

Topics: Magnetic order, Manganites, Scattering, Charge, Lamn03.
Publisher: American Physical Society
Year: 2003
DOI identifier: 10.1103/PhysRevLett.91.167205
OAI identifier:

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