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MA: Fachverband Magnetismus

MA 20: Multiferroics

MA 20.11: Vortrag

Mittwoch, 27. Februar 2008, 16:45–17:00, EB 202

Magnetic field dependent structural modulations in RFe₃(BO₃)₄ — •Martin Philipp¹, Olga Kataeva^1,2, Christian Hess¹, Jorge E. Hamann-Borrero¹, Rüdiger Klingeler¹, Natalia Tristan¹, Bernd Büchner¹, Martin von Zimmermann³, Alexander Vasiliev⁴, Elena Popova⁴, and Leonard N. Bezmaternykh⁵ — ¹Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01171 Dresden, Germany — ²A.E.Arbuzov Institute, Russian Academy of Sciences, Arbuzov Str. 8, 420088 Kazan, Russia — ³HASYLAB@DESY, Notkestr. 85, 22603 Hamburg, Germany — ⁴Physics Faculty, Moscow State University, 119992 Moscow, Russia — ⁵L.V.Kirensky Institute of Physics, Siberian Branch of RAS, 660036 Krasnoyarsk, Russia

Recently, rare earth iron borates RFe₃(BO₃)₄ (R: Rare Earth) attracted attention as candidates for possible multiferroic behavior. Most of the RFe₃(BO₃)₄ crystals exhibit antiferromagnetic order below ∼ 40 K. In this ordered phase several magnetic transitions are taking place, in dependence of temperature and magnetic field.
We have studied these magnetic transition by means of hard x-ray diffraction (hν= 100 keV) for the compounds TbFe₃(BO₃)₄, GdFe₃(BO₃)₄ and YFe₃(BO₃)₄. Several superlattice reflections could be observed, which indicate commensurate stuctural modulations along a- and c-axis. We compare the field and temperature dependence of these superlattice reflections with results from thermodynamics and transport measurements.