Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.61: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

Thermal conductivity of spin-1/2 chain compound LiCu₂O₂ — •Agnieszka Kondrat¹, Patrick Ribeiro¹, Nikolai Hlubek¹, Christian Hess¹, Bernd Büchner¹, and Sang-Wook Cheong² — ¹Leibniz Institute for Solid State and Materials Research Dresden, Germany — ²Rutgers Center for Emergent Materials & Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey, USA

We report on heat conductivity measurements of Heisenberg spin-1/2 chain compound LiCu₂O₂. κ(T) along the chains reveals a double-peak structure, where the minimum on the curve (T=24K) corresponds to a magnetic phase transition from paramagnetic to a spirally ordered state. Thermal conductivity is slightly dependent on magnetic field. A comparison is made to another spin-chain compound SrCuO₂, where excess thermal conductivity of magnetic origin was found along the chain direction.