Universität zu Köln

Tanaka, A., Chang, C. F., Buchholz, M., Trabant, C., Schierle, E., Schlappa, J., Schmitz, D., Ott, H., Metcalf, P., Tjeng, L. H. and Schuessler-Langeheine, C. (2013). Analysis of charge and orbital order in Fe3O4 by Fe L-2,L-3 resonant x-ray diffraction. Phys. Rev. B, 88 (19). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

To elucidate charge and orbital order below the Verwey transition temperature T-V similar to 125 K, a thin layer of magnetite partially detwined by growth on the steppedMgO(001) substrate has been studied by means of soft x-ray diffraction at the Fe L-2,L-3 resonance. The azimuth angle, incident photon polarization, and energy dependence of the (001/2)(c) and (001)(c) reflection intensities have been measured, and analyzed using a configuration-interaction FeO6 cluster model. The azimuth dependence of the (001/2)(c) reflection intensities directly represents the space-group symmetry of the orbital order in the initial state rather than indirectly through the intermediate-state level shifts caused by the order-induced lattice distortions. From the analysis of the (00 1 2) c reflection intensities, the orbital order in the t2g orbitals of B sites below T-V is proved to have a large monoclinic deformation with the value of Re[F-xy]/Re[F-yz] similar to 2. This finding contradicts the majority of theories on the Verwey transition so far proposed. We show that the experimentally observed resonance spectra cannot be explained by orbital and charge orders obtained with recent LDA+ U and GGA+ U band structure calculations but by a complex-number orbital order with excellent agreement.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tanaka, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chang, C. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buchholz, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Trabant, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schierle, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlappa, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmitz, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ott, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Metcalf, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tjeng, L. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schuessler-Langeheine, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-472133
DOI:	10.1103/PhysRevB.88.195110
Journal or Publication Title:	Phys. Rev. B
Volume:	88
Number:	19
Date:	2013
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LOW-TEMPERATURE PHASE; VERWEY TRANSITION; MAGNETITE FE3O4; YBA2CU3O7-DELTA FILMS; CRYSTAL SYMMETRY; GROWTH; MBE; SCATTERING; DYNAMICS; MOMENTS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47213