Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.144: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Structural and magnetic properties of ZnV2O4 — •Matthias Klemm, Stefan Ebbinghaus, and Siegfried Horn — Institut f. Physik, Universität Augsburg, 86159 Augsburg, Germany
The compound ZnV2O4 is isostructural to the heavy fermion
system LiV2O4 and crystallizes in the cubic spinel-type
structure. The vanadium ions occupy octahedral sites and form a
network of corner-sharing tetrahedra, which is magnetically
frustrated with respect to nearest neighbour antiferromagnetic
interactions. To investigate the possible role of magnetic
frustration in both systems we investigated the structural and
magnetic properties of single crystals of ZnV2O4. The
structural investigation show our crystals to be of high quality
and to display the Fd3m structure at room temperature. No
indications for site interchange between Zn and V are found.
While ZnV2O4 polycrystals show a structural transition at
T=50 K and subsequently antiferromagnetic order [1], the formation
of a spin-glass state is observed at low temperatures in single
crystals, which we attribute to magnetic frustration effects.
The possible reasons for the different behavior of single- and
polycrystalline materials is discussed.
Y. Ueda, N. Fujiwara, and H. Yasuoka,
J. Phys. Soc. Jpn. 66, 778 (1997).
This work was supported by DFG (SFB 484)