Magnetic field induced structural changes in magnetite observed by resonant x-ray diffraction and Mössbauer spectroscopy

Autor: Tomasz Kolodziej, Pavel Novák, Helena Štěpánková, Jan Żukrowski, V. Chlan, P. Babik, Z. Tarnawski, Izabela Bialo, Andrzej Kozłowski, J. E. Lorenzo, E. Wilke, Z. Kąkol, W. Tabiś, Claudio Mazzoli, Yves Joly, R. Řezníček, J. Niewolski, Maciej Zubko, Jurgen M. Honig, K. Łątka
Přispěvatelé: SOLARIS National Synchrotron Radiation Centre, AGH University of Science and Technology [Krakow, PL] (AGH UST), Silesian Center for Education and Interdisciplinary Research, University of Silesia, Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Magnétisme et Supraconductivité (MagSup), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), European Synchrotron Radiation Facility (ESRF), Brookhaven National Laboratory [Upton, NY] (BNL), U.S. Department of Energy [Washington] (DOE)-UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), Charles University [Prague] (CU), Leipzig University, CHARLES UNIVERSITY IN PRAGUE FACULTY OF MATHEMATICS AND PHYSICS PRAGUE CZE, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), J. Heyrovský Institute of Physical Chemistry of the ASCR, Czech Academy of Sciences [Prague] (CAS), Surfaces, Interfaces et Nanostructures (SIN), Purdue University [West Lafayette]
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Physical Review B
Physical Review B, American Physical Society, 2020, 102 (7), pp.075126. ⟨10.1103/PhysRevB.102.075126⟩
ISSN: 2469-9950
2469-9969
DOI: 10.1103/PhysRevB.102.075126⟩
Popis: When a magnetic field is applied to a single crystal of magnetite at $124\phantom{\rule{0.16em}{0ex}}\mathrm{K}gTg50\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, the monoclinic ${c}_{M}$ axis, which is the easy magnetization axis, switches to one of the ⟨100⟩ cubic directions, nearest to the direction of the magnetic field, and the phenomenon known as an axis switching (AS) occurs. A global symmetry probe, resonant x-ray scattering, and a local probe, M\"ossbauer spectroscopy, are used to better understand the mechanism of axis switching. The behavior of three subsystems ordered below the Verwey transition temperature ${T}_{V}$, i.e., lattice distortion, an orbital, and charge orderings, was observed via resonant x-ray scattering as a function of an external magnetic field. This was preceded by calculation of selected peak intensities using the fdmnes code. The M\"ossbauer spectroscopy studies confirmed that the magnetic field triggers electronic rearrangements and atomic displacements. The structure observed after the process of axis switching is very similar to the one obtained after cooling below ${T}_{V}$ with the magnetic field applied along one of the initial ⟨100⟩ cubic directions and distinct from the cooling in the absence of a magnetic field. From all the experimental observations of the phenomenon done so far, it is clear that AS starts from the fluctuations between octahedral iron orbitals that ultimately lead to the Verwey transition, but also to the higher-temperature trimeron dynamics. Therefore, further observation of the axis switching may be a key point to the understanding of a majority of strongly correlated electronic behavior in magnetite as well as in other transition metal oxides.
Databáze: OpenAIRE
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