The structural symmetry of epitaxial Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} thin films
- Superconductive Materials Laboratory, Department of Chemistry and New York State Institute on Superconductivity, State University of New York at Buffalo, Buffalo, New York 14260-3000 (United States)
- Materials Science Division and Science Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439-4845 (United States)
Epitaxial films of Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} (Tl-2201) have been prepared on SrTiO{sub 3} by sputtering and postdeposition annealing. The films were deposited onto (100)SrTiO{sub 3} single crystal substrates by rf magnetron sputtering and then annealed using a two-step process. The annealed films typically exhibit transition temperatures of about 11 K. Subsequent reannealing to optimize the oxygen doping in the film results in an increase in the transition temperature, and optimally reannealed films exhibit transition temperatures of about 83 K. The crystal structure of these films has been studied by x-ray diffraction and transmission electron microscopy. These results indicate that both the annealed ({ital T}{sub {ital c}}=11 K) and optimally reannealed samples ({ital T}{sub {ital c}}=83 K) have a tetragonal crystal structure. This structural information is crucial in evaluating recent measurements on these films to determine the electron pairing symmetry ({ital d} wave or {ital s} wave) in high-{ital T}{sub {ital c}} superconductors. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- ANL (Argonne National Laboratory (ANL), Argonne, IL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 383724
- Journal Information:
- Applied Physics Letters, Vol. 69, Issue 12; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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