Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 32: Correlated Electrons - Low-dimensional Materials II

TT 32.3: Vortrag

Dienstag, 8. März 2005, 16:45–17:00, TU H2053

One-dimensional magnetic thermal conductivity of Ca-doped SrCuO₂ — •Patrick Ribeiro¹, Christian Hess², and Bernd Büchner¹ — ¹IFW-Dresden, Germany — ²DPMC-Geneva, Switzerland

We present results on the heat conduction of the Ca-doped SrCuO₂-system, which is a prototype system for spin 1/2 Heisenberg-chains. 1D-magnetic heat transport is present in this compound, giving rise to a strong anisotropy of the heat conduction tensor. The separation of the magnetic contributions from the phonon background is ambiguous in the pure material SrCuO₂. By doping it with Ca, the phononic contribution to the heat conduction is partially suppressed by enhanced phonon-defect scattering. Concomitantly, the electronic configuration of Cu is only weakly affected, since Ca is isovalent to Sr. Hence, no strong changes in the magnetic conductivity are to be expected. This leads to a better separation of both contributions. First results of the thereby obtained magnetic heat conduction will be presented and discussed.