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TT: Tiefe Temperaturen

TT 6: Postersitzung I: Josephsonkontakte und SQUIDs, Supraleitung: Theorie, Korrelierte Elektronen, Niederdimensionale Systeme, Magnetotransport, Quantenhalleffekt, Kohlenstoff-Nanoröhrchen, Quantenflüssigkeiten

TT 6.37: Poster

Monday, March 26, 2001, 14:30–17:00, Rang S\ 3

Substitution Study of the 2D spin dimer compound SrCu₂(BO₃)₂ — •K.Y. Choi¹, P. Lemmens¹, G. Güntherodt¹, K. Sparta², G. Roth², F. Hüning³, H. Lueken³, H. Kageyama⁴, K. Onizuka⁴, and Y. Ueda⁴ — ¹2. Physikalisches Institut, RWTH Aachen — ²Institut für Kristallographie, RWTH Aachen — ³Institut für Anorgan. Chemie, RWTH Aachen, Aachen, Germany — ⁴ISSP, Univ. of Tokyo, Kashiwa, Japan

By means of magnetic susceptibility, X-ray diffraction and inelastic light scattering we have carried out investigations on the quantum spin system SrCu₂(BO₃)₂. The existence of a structural phase transition at T=395K and magnetic bound states at lower temperature has been demonstrated. Measurements of the magnetic susceptibility show that the transition has an effect on magnetic interlayer coupling. Furthermore, the effect of Ba- and Zn-substitution on this transition as well as on the magnetic bound states has been examined. In comparison to the pure compound the substitution leads to a suppression of the magnetic bound states and an enhancement of the structural instability.
Work supported by DFG