Microstructure and properties of YBa2Cu3O9-δ superconductors with transitions at 90 and near 290 K

Narayan, J.; Shukla, V. N.; Lukasiewicz, S. J.; Biunno, N.; Singh, R.; Schreiner, A. F.; Pennycook, S. J.
September 1987
Applied Physics Letters;9/21/1987, Vol. 51 Issue 12, p940
Academic Journal
We have investigated the microstructure and properties of YBa2Cu3O9-δ that contain resistive transitions at 90 and near 290 K using high-resolution and analytical transmission electron microscopy and Raman scattering techniques. The specimens contain normal orthorhombic (Pmmm space group) phase associated with Tc=90 K, and another phase which we tentatively assign it to be associated with the resistive transitions near 290 K. The new phase has a c axis larger by about 16% and it grows epitaxially on the {100} planes of the orthorhombic (tripled perovskite unit cell) phase having Tc=90 K.


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