Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 3: Spin-Systeme und itinerante Magnete

TT 3.9: Vortrag

Montag, 8. März 2004, 11:30–11:45, H18

Effects of proper crystal embedding for low dimensional spin systems — •H. Rosner¹, S.-L. Drechsler², M. Knupfer², J. Málek², H. Eschrig², J. Richter³, A. Moskvin⁴, W. Ku⁵, and W.E. Pickett⁵ — ¹Max Planck Institut für Chemische Physik fester Stoffe — ²Institut für Festkörper- und Werkstoffforschung Dresden — ³Universität Magdeburg — ⁴Ural State University Ekatarinenburg, Russia — ⁵University of California Davis, USA

Many approaches for the description of low dimensional spin systems consider their isolated structural units only. Here, we emphasize the importance of the proper embedding of these structural units in the crystal. Effects resulting from the crystal field and the inter-unit interaction are studied in detail for several selected model compounds as Li₂CuO₂, LiCu₂O₂, Cu(Si)GeO₃ or CaCu₂O₃. Band structure calculation, exact diagonalization and various spectroscopic, magnetic and thermodynamic data are joined to suggest a novel consistent picture.