Regensburg 2010 – wissenschaftliches Programm
DS 8.12: Vortrag
Montag, 22. März 2010, 17:00–17:15, H3
Non-Resonant Magnetic X-ray Scattering on Rare-Earth Iron Borates RFe3(BO3)4 — •Jorge E. Hamann-Borrero1, Martin Philipp1, Olga Kataeva2, Martin von Zimmermann3, Christian Hess1, Ruediger Klingeler1, Alexander Vasiliev4, Leonard Bezmaternykh5, and Bernd Buechner1 — 1IFW Dresden, 01171 Dresden, Germany — 2A.E.Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences, Kazan, Russia — 3HASYLAB at DESY, Hamburg, Germany. — 4Low Temperature Physics department, Faculty of Physics, Moscow State University, Moscow, Russia. — 5L.V Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, Russia.
Non-resonant magnetic XRD (NRMXRD) experiments with photon energy of 100keV where performed on selected compounds of the RFe3(BO3)4 family as a function of temperature and applied magnetic field. The results show the existence of several unexpected diffraction features, in particular the presence of a magnetic super-lattice peak, and the appearance of two reflections that violate the diffraction conditions for the low temperature phase P3121 of the iron borates. The magnetic nature of the former is concluded from analysing the scattering cross section at high energies and the magnetic structure of the different compounds. It is shown that the magnetic reflection reveals the magnetic properties of the material. For GdFe3(BO3)4, values for the component of the spin moment perpendicular to the scattering plane (S⊥) have been determined as well as the angle between the spin moment and the hexagonal basal plane.
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