Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.11: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Magnetic heat conduction in Ca-doped SrCuO₂ spin chains — •P. Ribeiro¹, A. Waske¹, C. Hess¹, G. Behr¹, R. Klingeler¹, D. Elefant¹, B. Büchner¹, and G. Roth² — ¹IFW Dresden, Germany — ²RWTH Aachen, Germany

We present new results on the heat conduction of the spin-chain system Sr_1−xCa_xCuO₂. The structure of this material contains two parallel antiferromagnetic S=1/2 copper chains with a J_||≈2100 K. They are decoupled from each other due to a frustration arising from the displacement of half a Cu-Cu distance between them. In addition to the regular phonon heat conduction this material possesses spinon contributions in the chain direction. A separation of both contributions is most ambiguous, since the spinon contribution appears in form of a shoulder on the low-temperature phonon peak. In order to achieve a better separation of both contributions we isovalently substituted Ca for Sr, which leads to a suppression of the phonon heat conduction, while a strong affect on the magnetic system in the substance is not expected.