P.S. Bagus, J.B. Torrance
Physical Review B
An orthorhombic-to-tetragonal phase transformation in YLa xBa2-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 T c≤42 K and are tetragonal. An analysis of the YLa 0.6Ba1.4Cu3O6.99 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.
P.S. Bagus, J.B. Torrance
Physical Review B
A. Girlando, R. Bozio, et al.
Physical Review B
T.C. Huang, E. Moran, et al.
Physica C: Superconductivity and its applications
R. Beyers, S.S.P. Parkin, et al.
Applied Physics Letters