Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)
MA 32.51: Poster
Freitag, 29. Februar 2008, 11:15–14:00, Poster E
Coupling of structure and magnetism in multiferroic RFe3 (BO3)4: Magnetostriction and thermodynamic studies — •Liran Wang1,2, Rüdiger Klingeler1, Natalia Tristan1, Christian Hess1, Bernd Büchner1, Martin Philipp1, Leschner Janet1, Norman Leps1, Olga Kataeva1,3, Elena Popova4, Alexander Vasiliev4, and L.N Bezmaternykh5 — 1Leibniz-Institute for Solid State and Materials Research IFW Dresden,Dresden,Germany — 2IMPRS,Dynamical Processes in Atoms Molecules and Solids,Nöthnitzer Str.38,Dresden,Germany — 3A.E.Arbuzov Institute, Russian Academy of Science,Arbuzov Str.8,Kazan,Russia — 4Physics Faculty,Moscow State University,Moscow,Russia — 5L.V.Kirensky Institute of Physics,Siberian Branch of RAS, Kransnoyarsk, Russia
Rare earth ferroborates exhibit a rich phase diagram owing to the interplay 3d- and 4f-electrons. This interplay gives rise to an interesting structural and magnetic properties and it was found recently that at least two compounds of this series, i.e. R = Gd, Nd, exhibit multiferroism at low temperatures. Here, we present magnetostriction, thermodynamic and dielectric measurements on TbFe3(BO3)4, DyFe3(BO3)4 and NdFe3(BO3)4 single crystals. The data show that, in the antiferromagnetically Fe-spin ordered phase below TN at nearly 40K, there is a field induced spin-flop of the Fe spins superimposed by a spin-flip of the rare earth moments. This transition is accompanied by significant structural changes. The results are discussed in terms of a mean-field coupling model between the 3d- and the 4f-subsystem.