Formation and properties of novel artificially-layered cuprate superconductors using pulsed-laser deposition [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- 11 pages : digital, PDF file
- Additional Creators:
- Oak Ridge National Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information - Access Online:
- www.osti.gov
- Summary:
- Pulsed-laser deposition and epitaxial stabilization have been effectively used to engineer artificially-layered thin-film materials. Novel cuprate compounds have been synthesized using the constraint of epitaxy to stabilize (Ca,Sr)CuO₂/(Ba,Ca,Sr)CuO₂ superconducting superlattices in the infinite layer structure. Superlattice chemical modulation can be observed from the x-ray diffraction patterns for structures with SrCuO₂ and (Ca, Sr)CuO₂ layers as thin as a single unit cell (∼3. 4 Å). X-ray diffraction intensity oscillations, due to the finite thickness of the film, indicate that (Ca,Sr)CuO₂ films grown by pulsed-laser deposition are extremely flat with a thickness variation of only ∼20 Å over a length scale of several thousand angstroms. This enables the unit-cell control of (Ca, Sr)CuO₂ film growth in an oxygen pressure regime in which in situ surface analysis using electron diffraction is not possible. With the incorporation of BaCuO₂ layers, superlattice structures have been synthesized which superconduct at temperatures as high as 70 K. Dc transport measurements indicate that (Ca, Sr)CuO₂/BaCuO₂ superlattices are two dimensional superconductors with the superconducting transition primarily associated with the BaCuO₂ layers. Superconductivity is observed only for structures with BaCuO₂ layers at least two unit cells thick with {Tc} decreasing as the (Ca,Sr)CuO₂ layer thickness increases. Normalized resistance in the superconducting region collapse to the Ginzburg-Landau Coulomb gas universal resistance curve consistent with the two-dimensional vortex fluctuation model.
- Subject(s):
- Note:
- Published through SciTech Connect.
03/01/1996.
"conf-960163--18"
"DE96009714"
Photonics West `96: conference on quantum well and superlattice physics VI, San Jose, CA (United States), 27 Jan - 2 Feb 1996.
Norton, D.P.; Budai, J.D.; Chakoumakos, B.C. - Funding Information:
- AC05-96OR22464
View MARC record | catkey: 14456705