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Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 19: Correlated Electrons: Low-dimensional Materials

TT 19.2: Talk

Tuesday, March 28, 2006, 14:15–14:30, HSZ 301

Revisiting the magnetism of hole-doped CuO2 spin chains in Sr14−xCaxCu24O41 — •Jürgen Schnack1, Rüdiger Klingeler2, Vladik Kataev2, and Bernd Büchner21Universität Osnabrück, Fachbereich Physik — 2Leibniz-Institute for Solid State and Materials Research IFW Dresden, Germany

Magnetization measurements of Sr14−xCaxCu24O41 with 0 ≤ x ≤ 12 in magnetic fields up to 16 T show that the low temperature magnetic response of the CuO2 spin chains changes strongly upon doping [1]. For x=0 quantum statistical simulations [2] yield that the temperature and field dependence of the magnetization can be well described by an effective Heisenberg model in which the ground state configuration is composed of spin dimers, trimers, and monomers [3]. Reduction of the number of holes in the chains through Ca-doping leads to an additional contribution to the magnetization, which depends linearly on the magnetic field. Remarkably, the slope of this linear contribution increases with the Ca content. We discuss this behavior in the context of an effective Heisenberg model for hole-doped spin chains [2].

[1] R. Klingeler et al., cond-mat/0511110

[2] J. Schnack, Eur. Phys. J. B 45 (2005) 311

[3] R. Klingeler et al., cond-mat/0508626

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