Structural phase transformation in the superconducting YLaxBa2-xCu3O7 compounds

Huang, T. C.; Tokura, Y.; Torrance, J. B.; Nazzal, A. I.; Karimi, R.
May 1988
Applied Physics Letters;5/30/1988, Vol. 52 Issue 22, p1901
Academic Journal
An orthorhombic-to-tetragonal phase transformation in YLaxBa2-xCu3O7 has been observed as a function of x, but with the same oxygen concentration, from x-ray powder diffraction data. Compounds with x≤0.37 have Tc in the 93–53 K range and are orthorhombic, while compounds with x≥0.45 have Tc≤42 K and are tetragonal. An analysis of the YLa0.6Ba1.4Cu3O6.99 diffraction pattern suggests that the tetragonal structure is closely related to those of the orthorhombic YBa2Cu3O7 and the tetragonal YBa2Cu3O6 with a partial substitution of La3+ ion on the Ba2+ site and a disorder of oxygen atoms at the midpoints of both a and b unit cell edges.


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