Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.55: Poster
Donnerstag, 17. März 2011, 10:00–13:00, P1
On the influence of inter-chain couplings on the magnetic properties of the strongly frustrated chain cuprate Li2CuO2 — •W.E.A. Lorenz1, S.-L. Drechsler1, R.O. Kuzian2, S. Nishimoto1, S. Petit3, Y. Skourski4, N. Wizent1, R. Klingeler5, and B. Büchner1 — 1Leibniz-Inst. f. Festkörper- & Werkstoffforschung, Dresden, Germany — 2Inst. f. Problems of Materials Science, Kiev, Ukraine — 3Laboratoire Léon Brillouin, Saclay, France — 4Hochfeld-Magnetlabor Dresden(HLD), FZ-Dresden-Rossendorf, Dresden, Germany — 5Kirchhoff Institute for Physics, University of Heidelberg, Heidelberg, Germany
We report on detailed experimental and theoretical studies on the magnetic properties
of Li2CuO2. This compound serves as a simple, but representative model system for an
interesting class of spin-chain materials. Their magnetic properties are determined by strong
nearest-neighbor ferromagnetic interactions in the chain which are frustrated by an
antiferromagnetic (afm) coupling to next-nearest-neighbors. The competition of interactions can
induce incommensurate correlations in the chain. On the example of Li2CuO2 we illustrate on
the basis of our thermodynamical and inelastic neutron scattering data, how relatively weak
inter-chain couplings can prevent incommensurate long-range order and determine solely the
saturation field [1,2]. In particular, we discuss the influence of the inter-chain couplings onto
the magnetic phase transitions.
W.E.A. Lorenz et al., Europhys. Lett. 88, 37002 (2009).
S.
Nishimoto et al., arXiv:1004.3300v2 (2010).