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DPG

Dresden 2003 – scientific programme

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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 14.150: Poster

Tuesday, March 25, 2003, 15:15–19:15, Zelt

Micro-Raman spectroscopy and magnetic characterization of the s=1/2 Dimer system CuTe2O5 — •A.-M. Carsteanu1, J. Schoenes1, P. Lemmens2,3, R.K. Kremer3, and M. Johnsson41Institut für Halbleiterphysik und Optik, TU Braunschweig, 38106 Braunschweig, Germany — 2IMNF, TU Braunschweig, 38106 Braunschweig, Germany — 3MPI-FKF Stuttgart — 4Dept. Inorg. Chemistry, Stockholm Univ., 10691 Stockholm, Sweden

The quantum antiferromagnet CuTe2O5 represents a clean s=1/2 dimer system of Cu2+, 3d9 moments with negligible interdimer interaction or frustration. The monoclinic crystal structure contains well separated Cu2O10 dioctahedra. The magnetic susceptibility can very well be fitted to the Bleaney expression using an antiferromagnetic exchange constant of J=90K. We have investigated the Raman response of the system as function of temperature and compare these results with a detailed factor group analysis. Further magnetic and Raman investigations involved Zn- and Ni-substitutions on the Cu site of this system. We acknowledge support by DFG SPP1073.

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