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

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 asso...

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Bibliographic Details
Published in:Applied physics letters 1987-09, Vol.51 (12), p.940-942
Main Authors: NARAYAN, J, SHUKLA, V. N, LUKASIEWICZ, S. J, BIUNNO, N, SINGH, R, SCHREINER, A. F, PENNYCOOK, S. J
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.98808