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TT: Fachverband Tiefe Temperaturen
TT 18: CE: Low-dimensional Systems - Materials 1
TT 18.4: Vortrag
Montag, 14. März 2011, 19:15–19:30, HSZ 201
The influence of inter-chain couplings on the thermodynamics 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. Büuchner1 — 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 spin-chain
materials in which 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, that relatively weak inter-chain couplings can prevent incommensurate long-range
order and determine solely the saturation field. The inter-chain coupling derived from the
saturation field are in excellent agreement with inelastic neutron scattering data [1,2]. The
absence of bound magnon states in Li2CuO2 is explained in terms of the inter-chain couplings
exceeding a critical value of a few meV, only.
W.E.A. Lorenz et al.,
Europhys. Lett. 88, 37002 (2009).
S. Nishimoto et al., arXiv:1004.3300v2
(2010).