Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Correlated Electrons: Low-Dimensional Systems -Materials 2
TT 55.12: Vortrag
Donnerstag, 14. März 2013, 12:30–12:45, H21
Magnetic and structural properties of antiferromagnetic VF3 — •Patrick Reuvekamp1, Reinhard Kremer1, Roland Eger1, Gwilherm Nenert2, and Thomas Hansen2 — 1Max- Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany — 2Institut Laue-Langevin, 38042 Grenoble, France
We report on a magnetic and structural investigation of layered antiferromagnetic system vanadium (III) fluoride. VF3 crystallizes in a distorted ReO3 structure (R3c) with rotated undistorted VF6 octahedra. The V+3 cations are arranged in a triangular lattice with the possibility of exhibiting magnetic frustration. Polycrystalline samples of VF3 were investigated using heat capacity, dielectric, magnetic susceptibility and neutron powder diffraction methods. Combining our results, we confirmed that VF3 undergoes long-range antiferromagnetic order at ∼19 K in accordance with literature [1]. The antiferromagnetic order results in a magnetic structure with the magnetic moments alternating between a parallel and b parallel alignments in the ab plane . A second phase transition can be seen at ∼120 K in the heat capacity [1] and dielectric measurements possibly associated to a minute structural distortion.
[1] A.C. Gossard, H.J. Guggenheim, F.S.L. Hsu, and R.C. Sherwood, AIP Conf. Proc., No. 5, 302 (1971).