Regensburg 2002 – wissenschaftliches Programm
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MA: Magnetismus
MA 10: Poster : Dünne Schichten(1-21),Spinabh.Transp.(22-39),Exch.Bias(40-51),Spindyn.(52-55),Mikromag.(56-66),Partikel(67-74),Abb.Verf.(75-77),Oberfl.+Spinelektr.+Elektr.Theo+Mikromag(75-87),PÜ+Aniso+Werkst/Leg.(88-103),Mol.Mag.+N-dim+Messm.+Postdead(104-111
MA 10.108: Poster
Dienstag, 12. März 2002, 15:00–19:00, Bereich A
Ni5Te4X2O12, X=Cl, Br, I - a new 2D s=1 system with tunable interlayer coupling — •P. Lemmens1,2, J. Pommer2, G. Güntherodt2, H. Kageyama3, Z. Hiroi3, P. Millet4, K.W. Törnroos5, and M. Johnsson6 — 1IMNF, TU Braunschweig, Mendelsohnstr. 3, 38106 Braunschweig, Germany — 22. Phys. Institut, RWTH Aachen, 52056 Aachen, Germany — 3ISSP Tokyo, Kashiwa, Chiba 277-8581, Japan — 4CEMS-CNRS, BP 4367, Toulouse Cedex 4, France — 5Dept. Chemistry, Univ. of Bergen, 5007 Bergen, Norway — 6Dept. Inorg. Chemistry, Stockholm Univ., 10691 Stockholm, Sweden
In the recently discovered series Ni5Te4X2O12, X=Cl, Br, I, a two-dimensional Ni-O-network is
sandwiched by Te-halide-coordinations forming a layered structure
[1]. The complex coordination of Ni gives rise to competing
antiferromagnetic superexchange interactions. As the ionic radii
of the halides strongly vary within the series a tuning of the
interlayer coupling may be expected. A well pronounced divergence
of the zero-field and field-cooled magnetic susceptibility has
been found and taken as evidence for a spin glass transition. The
transition temperatures range from 6 to 30 K within the series.
We acknowledge support by DFG SPP1073.
M.
Johnsson, et al, in preparation.