Noncollinear Ordering of the Orbital Magnetic Moments in Magnetite.

Autor: Elnaggar H; Debye Institute for Nanomaterials Science, Utrecht University, 3584 CA Utrecht, The Netherlands., Sainctavit P; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, MNHN, UMR7590, 75252 Paris Cedex 05, France., Juhin A; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, MNHN, UMR7590, 75252 Paris Cedex 05, France., Lafuerza S; European Synchrotron Radiation Facility, CS40220, F-38043 Grenoble Cedex 9, France., Wilhelm F; European Synchrotron Radiation Facility, CS40220, F-38043 Grenoble Cedex 9, France., Rogalev A; European Synchrotron Radiation Facility, CS40220, F-38043 Grenoble Cedex 9, France., Arrio MA; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, MNHN, UMR7590, 75252 Paris Cedex 05, France., Brouder C; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, MNHN, UMR7590, 75252 Paris Cedex 05, France., van der Linden M; Debye Institute for Nanomaterials Science, Utrecht University, 3584 CA Utrecht, The Netherlands.; European Synchrotron Radiation Facility, CS40220, F-38043 Grenoble Cedex 9, France., Kakol Z; Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland., Sikora M; Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland., Haverkort MW; Institut für Theoritiche Physik, Universität Heidelberg, Philosophenweg 19, 69120 Heidelberg, Germany., Glatzel P; European Synchrotron Radiation Facility, CS40220, F-38043 Grenoble Cedex 9, France., de Groot FMF; Debye Institute for Nanomaterials Science, Utrecht University, 3584 CA Utrecht, The Netherlands.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2019 Nov 15; Vol. 123 (20), pp. 207201.
DOI: 10.1103/PhysRevLett.123.207201
Abstrakt: The magnitude of the orbital magnetic moment and its role as a trigger of the Verwey transition in the prototypical Mott insulator, magnetite, remain contentious. Using 1s2p resonant inelastic x-ray scattering angle distribution (RIXS-AD), we prove the existence of noncollinear orbital magnetic ordering and infer the presence of dynamical distortion creating a polaronic precursor for the metal to insulator transition. These conclusions are based on a subtle angular shift of the RIXS-AD spectral intensity as a function of the magnetic field orientation. Theoretical simulations show that these results are only consistent with noncollinear magnetic orbital ordering. To further support these claims we perform Fe K-edge x-ray magnetic circular dichroism in order to quantify the Fe average orbital magnetic moment.
Databáze: MEDLINE