Abstract
ac susceptibility studies of single crystals of YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ have been carried out with an ac field parallel or perpendicular to the surface of these crystals. The analysis of the results gives evidence for a staircase structure in which oxygen deficiencies increase towards the sample core. As a consequence, the oxygen mobility appears to be extremely anisotropic, favoring the c axis.
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