Abstract
Structural and magnetic properties of highly oxygen deficient orthorhombic YBa 2Cu 3O 6.39 prepared by a desorption-absorption procedure were investigated by elastic neutron scattering and SQUID measurements. Unusually large anisotropic vibrational amplitudes of the Cu-O-Cu broken chain oxygen atoms are discussed in terms of an anisotropic thermal vibration model and compared with a split site model. The Cu-O planes remain unaffected, their distance to the Cu-O-Cu chains increases. In contrast to quenched material no indications for any oxygen occupation at ( 1 2 , 0, 0) were found. The diamagnetic shielding (ZFC) signal is reduced compared to oxygen rich material, the Meissner signal remains 65% of the shielding value.
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