Static and dynamical behaviour of Ca_(2+x)Y_(2-x)Cu_(5)O_(10)

Charge doping into the CuO_2 -chains of copper oxide Ca_(2+x)Y_(2-x)Cu_(5)O_(10) reveals exceptional charge and spin behavior. Bulk measurements suggest undoped Ca_(2+x)Y_(2-x)Cu_(5)O_(10) and slightly doped compounds (0 < x < 1.2) to be 3D Heisenberg antiferromagnets with decreasing magnetic moment and N'eel temperature, whereas 1D Heisenberg behavior characterizes the samples near the critical doping concentration (x approx 1.2). Highly doped compounds (x > 2) exhibit again antiferromagnetic long range order. We present specific heat and susceptibility measurements that give insight into the development of static magnetic behavior with doping. mu R- and neutron-scattering measurements add microscopic information about structure and dynamics of the compound series.

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