Magnetisation of hole-doped CuO2 spin chains in Sr14-xCaxCu24O41

Details Magnetisation of hole-doped CuO2 spin chains in Sr14-xCaxCu24O41 Magnetisation of hole-doped CuO2 spin chains in Sr14-xCaxCu24O41

2005-11-04

arxiv.org/abs/cond-mat/0511110v1

Phys. Rev. B 72, 184406 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.72.184406

We report on magnetisation measurements of Sr14-xCaxCu24O41, with 0 <= x <= 12, in magnetic fields up to 16 T. The low temperature magnetic response of the CuO2 spin chains changes strongly upon doping. For x = 0, the ground state with nearly independent dimers is confirmed. Reduction of the number of holes in the chains through Ca-doping leads to an additional contribution to the magnetisation, which depends linearly on the magnetic field. Remarkably, the slope of this linear contribution increases with the Ca content. We argue that antiferromagnetic spin chains do not account for this behaviour but that the hole dynamics might be involved.

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