Abstract
Atomic-resolution images from superconducting and nonsuperconducting samples of YBa2Cu3O7−x have been obtained by field ion microscopy. Both phases of the material exhibit a similar layered structure in the field ion images. Transmission electron micrographs of superconducting field ion tips show vividly the twinned structure of the orthorhombic phase. Time-of-flight (atom-probe) mass spectra from the two materials differ primarily in an enhanced molecular oxygen signal from the superconducting samples indicating that oxygen in the O(4) sites (CuO chains) is field desorbed preferentially as molecular oxygen ions.
Similar content being viewed by others
References
M.K. Wu et al.: Phys. Rev. Lett.58, 908–911 (1987)
G.L. Kellogg, S.S. Brenner: Appl. Phys. Lett.51, 1851–1853 (1987)
A.J. Melmed et al.: Science239, 176–178 (1988)
G.L. Kellogg, S.S. Brenner: In AIP Conference Proceedings No. 165, ed. by J.M.E. Harper, R.J. Colton, L.C. Feldman (American Institute of Physics, New York 1988) pp. 421–426
O. Nishikawa, M. Nagai: Phys. Rev. B37, 3685–3688 (1988)
A. Cerezo et al.: Appl. Phys. Lett.52, 1020–1022 (1988)
S.S. Brenner, G.L. Kellogg: Proc of MRS Symposium on High-T c Superconductors, Boston, MA, 30 Nov.–5 Dec. 1987
R.E. Loehman et al.: J. Am. Cer. Soc. (submitted)
E.W. Müller, T.T. Tsong:Field Ion Microscopy, Principles and Applications (Elsevier, New York 1969)
J.A. Panitz: J. Phys. E15, 1281–1294 (1982)
T.T. Tsong: Surf. Sci. Rep.8, 127–209 (1988)
J.A. Panitz: Prog. Surf. Sci.8, 219–262 (1978)
Y. Syono et al.: Jpn. J. Appl. Phys.26, L 498–501 (1987)
E.A. Hewat et al.: Nature327, 400–402 (1987)
R. Beyers et al.: Appl. Phys. Lett.50, 1918–1920 (1987)
M.O. Eatough et al.: Appl. Phys. Lett.51, 367–368 (1987)
D.W. Murphy et al.: Proc. Symposium on High-T c Superconductors, 193rd American Chemical Society National Meeting, Denver, CO, 1987 (in press)
G.L. Kellogg, S.S. Brenner: J. de Phys. (in press)