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Resonant soft x-ray powder diffraction study to determine the orbital ordering in A-site-ordered SmBaMn2O6


Garcia-Fernandez, M; Staub, U; Bodenthin, Y; Lawrence, S M; Mulders, A M; Buckley, C E; Weyeneth, S; Pomjakushina, E; Conder, K (2008). Resonant soft x-ray powder diffraction study to determine the orbital ordering in A-site-ordered SmBaMn2O6. Physical Review. B, Condensed Matter and Materials Physics, 77(6):060402.

Abstract

Soft x-ray resonant powder diffraction has been performed at the Mn L2,3 edges of A-site-ordered SmBaMn2O6. The energy and polarization dependences of the (1/4 1/4 0) reflection provide direct evidence for a (x2−z2)/(y2−z2)-type orbital ordering in contrast to single-layer manganite. The temperature dependence of the reflection indicates an orbital reorientation transition at [approximate]210 K, below which the charge- and orbital-ordered MnO2 sheets show AAAA-type of stacking. The concurring reduction of the ferromagnetic superexchange correlations leads to further charge localization.

Abstract

Soft x-ray resonant powder diffraction has been performed at the Mn L2,3 edges of A-site-ordered SmBaMn2O6. The energy and polarization dependences of the (1/4 1/4 0) reflection provide direct evidence for a (x2−z2)/(y2−z2)-type orbital ordering in contrast to single-layer manganite. The temperature dependence of the reflection indicates an orbital reorientation transition at [approximate]210 K, below which the charge- and orbital-ordered MnO2 sheets show AAAA-type of stacking. The concurring reduction of the ferromagnetic superexchange correlations leads to further charge localization.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2008
Deposited On:09 Feb 2009 16:16
Last Modified:05 Apr 2016 12:50
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.77.060402

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