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Electron microscopy of the infinite-layer superconducting oxide phase and related compounds

✍ Scribed by S. Tao; H.-U. Nissen; C. Beeli; M. Cantoni; M.G. Smith; J. Zhou; J.B. Goodenough

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 1011 KB
Volume: 204
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(92)90580-6

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✦ Synopsis

The infinite-layer phase existing in the compounds with composition Sr~_xRexCuO2 (Re=Pr, La) synthesized under high pressure has been investigated by high-resolution transmission electron microscopy as well as selected-area electron diffraction techniques. A few stacking faults with a/2 shear vectors occurring in the ( 1, 0, 0) or (0, 1, 0) planes as well as a local superstructure, caused by ordering of La-atoms, are observed in the infinite-layer phase with composition Sro.97Lao.o3CuO2. Two additional phases coexisting in the compound Sro.87Pro.t3CuO2 have also been identified. The first of these is an incommensurate phase with cell parameters a= 11.5/~,, b= 13.0 .~ and c= 4.0 A; it contains an approximately seven-fold structural modulation along the caxis. The second phase has cell parameters a= 3.86 A, b= 11.6 ]~ and c= 20.4/k. The remaining compounds investigated also contain up to three phases. A possible structural model for the incommensurate phase is suggested, and the calculated images obtained with this model yield an excellent fit with the experimental observations.

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