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Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.33: Poster

Tuesday, February 26, 2008, 15:15–18:30, Poster E

X-ray Diffraction studies on RFe3(BO3)4 — •Jorge Hamann Borrero1, Martin Philipp1, Olga Kataeva2, Rüdiger Klingeler1, Christian Hess1, Bernd Büchner1, Martin von Zimmermann3, Alexander Vasiliev4, and Leonard Bezmaternykh51Leibniz Institute for Solid State and Materials Research IFW Dresden, 01171 Dresden — 2A.E.Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences, Arbuzov Str. 8, Kazan, 420088, Russia — 3HASYLAB@DESY, Notzkestr. 85, 22603 Hamburg — 4Faculty of Physics, Moscow State University, Moscow, 119992 Russia — 5Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia

Mo X-ray radiation and hard X-rays diffraction experiments, with and without external magnetic field, were made on single crystalline RFe3(BO3)4 compounds (R = Tb, Gd, Nd, Dy and Y) in order to elucidate the various interesting crystal structures and phase transitions, with a special focus on TbFe3(BO3)4. The crystal structure of this compound is of space group R32 at room temperature and undergoes a symmetry reduction at T<192K to space group P3121 involving slight distortions of the TbO6 prisms and FeO6 octahedra. Distinct field dependent structural features were observed on TbFe3(BO3)4 when applying a magnetic field parallel to the c axis at T=2K. At fields higher than around 3T, a superstructure peak (0 0  1.5) appears as an indication of a new field induced structure which involves doubling of the unit cell along the c axis. These results are compared with the structures of the other rare earth and Y compounds.

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