MBE synthesis of YBa/sub 2/Cu/sub 3/O/sub y/ superconducting thin films

Author

Matijasevic, V.C. ; Appelboom, H.M. ; Mathu, F. ; Hadley, P. ; van der Marel, D. ; Mooij, J.E.

Author_Institution

Delft Univ. of Technol., Netherlands

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1524

Lastpage

1527

Abstract

Issues concerning molecular beam epitaxy (MBE) of the superconductor YBa/sub 2/Cu/sub 3/O/sub y/ are discussed. Films have been prepared by MBE at low pressures using molecular oxygen and ozone. A minimum incidence rate of each of these species for synthesis of YBa/sub 2/Cu/sub 3/O/sub y/ is established and compared with the thermodynamic stability data and lower kinetic limits. For ozone, the lower limit appears to be determined by the growth rate. The best films that are made at low pressures (less than 10/sup -2/ mbar of oxygen or with ozone) have, in general, slightly lower transition temperatures and expanded c-axes, but still sharp transitions and high critical currents. Cation disorder is suggested as a likely explanation for these properties. The model for solubility of Ba on the Y sites is discussed and found to be consistent with experimental results.<>

Keywords

barium compounds; critical currents; high-temperature superconductors; molecular beam epitaxial growth; solid solubility; superconducting epitaxial layers; superconducting transition temperature; yttrium compounds; 10/sup -2/ mbar; HTSC; MBE synthesis; O/sub 2/; O/sub 3/; YBa/sub 2/Cu/sub 3/O/sub y/ superconducting thin films; cation disorder; expanded c-axes; growth rate; high critical currents; low pressures; molecular beam epitaxy; solubility; transition temperatures; Composite materials; Control systems; Crystalline materials; Feedback; III-V semiconductor materials; Mass spectroscopy; Molecular beam epitaxial growth; Superconducting materials; Superconducting thin films; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233377

Filename

233377