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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.49: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Synthesis and characterization of low dimensional magnetic spin systems — •Johanna Frielingsdorf, Ralf Müller, Simon Scharffe, Martin Valldor, and Thomas Lorenz — II. Physikalisches Institut, Universität zu Köln

The physics of low-dimensinal spin systems is fundamentally controlled by quantum fluctuations and therefore a hot topic. Thus, the preparation of materials with suitable magnetic subsystems, that experimentally realize various theoretical model hamiltonians, is highly desireable. The synthesis and characterization of spin-chain systems such as BaCo₂V₂O₈, BaMn₂V₂O₈, SrMn₂V₂O₈, CoNb₂O₆, and Cs₂CoCl₄ is subject of this poster. These compounds provide transition-metal oxides with partly filled 3d shells and hence are suitable to study spin systems from S=1/2 to 5/2. BaCo₂V₂O₈, as a quasi one-dimensional S=1/2 Ising system, belongs to the alkaline earth (A)- transition metal(M)- vanadates AM₂V₂O₈. BaMn₂V₂O₈ on the other hand is an S=5/2 nearly isotropic Heisenberg system. CoNb₂O₆, known as columbite, is a quasi one-dimensional Ising ferromagnet and shows a complex interplay of quantum criticality and geometrical frustration. A quasi one-dimensional frustrated XY antiferromagnet is represented by Cs₂CoCl₄, where a spin-liquid ground state can be reached by applying magnetic fields.
This work is supported by the DFG through SFB 608.