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 14.150: Poster

Dienstag, 25. März 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. Lemmens^2,3, R.K. Kremer³, and M. Johnsson⁴ — ¹Institut 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.