Phys. Rev. B 72, 184406 (2005) [7 pages]Magnetization of hole-doped CuO2 spin chains in Sr14−xCaxCu24O41Received 4 May 2005; revised 13 July 2005; published 4 November 2005 We report on magnetization 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. A 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 argue that antiferromagnetic spin chains do not account for this behavior but that the hole dynamics might be involved. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.184406
DOI:
10.1103/PhysRevB.72.184406
PACS:
75.50.Ee, 75.40.Cx
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