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Brecht, E.; Schmahl, Wolfgang W.; Miehe, G.; Fuess, H.; Andersen, N. H.; Wolf, Th. (1994): Reduction and reoxidation experiments on YBa2Cu3-xAlXO6+δ single crystals. In: Physica C: Superconductivity and its Applications, Vol. 235-240, No. PART 1: pp. 471-472
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We performed thermal treatments in different atmospheres on tetragonal YBa2Cu3-xAlxO6+δ single crystals. The transformation from tetragonal tweed to orthorhombic twin structure of YBa2Cu3-xAlxO6+δ single crystals by reduction and subsequent reoxidation is reversible. The orthorhombicity of reoxidized crystals depends on the temperature during reduction.