Volume 42, Number 3, May I 1998
|Page(s)||339 - 344|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Transition from dimerization to antiferromagnetic order in quasi–one-dimensional
IBM Research Division, Zurich Research Laboratory,
8803 Rüschlikon, Switzerland
2 Laboratorium für Festkörperphysik, Swiss Federal Institute of Technology (ETH), 8093 Zürich, Switzerland
3 Physik-Institut der Universität Zürich, 8057 Zürich, Switzerland
Accepted: 16 March 1998
Magnetic susceptibility and torque anisotropy were measured on the novel quasi–one-dimensional cuprate . Substantial hole doping between 0.27 and 0.36 holes/Cu can be achieved by changing the oxygen content. This strongly influences dimerization, which originates from a modulated exchange coupling in the chains. Another interesting result is the unexpected transition at into an antiferromagnetic ordered state in spite of the high doping. By torque analysis the existence of an easy axis in this ordered state was clearly demonstrated and its orientation determined.
PACS: 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron source X-ray scattering, etc.) / 75.30.Gw – Magnetic anisotropy
© EDP Sciences, 1998
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