Stress induced change in hole concentration in superlattice films of bismuth-based oxide superconductors

Author

Hatano, T. ; Labat, S. ; Ishii, A. ; Arisawa, S. ; Togano, K.

Author_Institution

Nat. Res. Inst. for Metals, Ibaraki, Japan

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

2422

Lastpage

2425

Abstract

Superlattice films of bismuth-based oxide superconductors, for instance (2234)/sub 1/(2212)/sub 1/ and (2245)/sub 1/(2201)/sub 1/, have been synthesized by sequential sputter deposition of bismuth oxide, strontium-copper-oxide and calcium-copper-oxide monolayers. Crystal structures, superconducting transition temperatures and hole concentration of the films were studied by X-ray diffraction, Meissner effect and Hall effect measurements. It was observed that the superconducting transition temperatures were enhanced by forming superlattice films of overdoped (2212, 2201) and underdoped (2234, 2245) phases. The results can be understood by stress induced changes in the hole concentration between the overdoped and the underdoped phases originating from the epitaxial (lattice matching) formation of the superlattice films.

Keywords

Hall effect; Meissner effect; X-ray diffraction; bismuth compounds; calcium compounds; crystal structure; high-temperature superconductors; internal stresses; sputter deposition; strontium compounds; superconducting superlattices; superconducting thin films; superconducting transition temperature; Bi-based oxide superconductors; BiSrCaCuO; Hall effect; Meissner effect; X-ray diffraction; crystal structure; epitaxial formation; hole concentration; lattice matching; overdoped phases; sequential sputter deposition; stress induced hole concentration changes; superconducting transition temperature; superlattice films; underdoped phases; Bismuth; Hall effect; Sputtering; Stress; Strontium compounds; Superconducting films; Superconducting transition temperature; Superconductivity; Superlattices; X-ray diffraction;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784962

Filename

784962