Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 19: Correlated Electrons: Low-dimensional Materials

TT 19.1: Talk

Tuesday, March 28, 2006, 14:00–14:15, HSZ 301

Heat transport of spin chains in CaCu₂O₃ — •A. Waske¹, H. ElHaes², C. Hess¹, N. Wizent¹, M. Apostu¹, G. Behr¹, C. Sekar¹, G. Krabbes¹, B. Büchner¹, F. Heidrich-Meisner³, and W. Brenig³ — ¹IFW Dresden, Germany — ²RWTH Aachen, Germany — ³Institut für Theoretische Physik, TU-Braunschweig, Germany

We present experimental results for the magnon thermal conductivity κ_mag of the ladder-like material CaCu₂O₃. Due to the small Cu-O-Cu bonding angle within the ladders (∼ 120^∘) the magnetic rung coupling is much weaker than the magnetic coupling along the legs. Hence, at sufficiently high temperatures the material is expected to behave like independent spin chains. In our experiments, we find a strong signature of magnetic heat transport above ∼ 50 K, which appears to be linear in temperature. We estimate the magnetic mean free path which turns out to be of the order of 25 Å.