Cryogenic STM/STS observation on oxide superconductors
- Univ. of Tokyo (Japan)
- Tokyo Inst. of Technology, Yokohama (Japan)
The topographic and electronic properties of the surfaces of (001) and (110) oriented YBa[sub 2]Cu[sub 3]O[sub y] epitaxial films have been probed by atomic resolution STM/STS at 4.2 K. The STM image on the (001) surface clearly revealed the atomic corrugation of the tetragonal lattice with an average spacing of 0.4 nm, while on the (110) surface the orthorhombic atomic lattice, corresponding to the Cu atoms of both CuO[sub 2] and CuO chain planes, was observed. The STS result on the (001) surface indicated the semiconducting nature of the terminating layer. As the tunneling tip came closer to the surface, however, the shape of the tunneling spectrum became more metallic and showed a superconducting energy gap, which seems to arise from the underlying superconducting layer. On the other hand, the tunneling spectra on the (110) surface indicated superconducting gap structures, independent of the tip-sample distance. 11 refs., 5 figs.
- OSTI ID:
- 6621106
- Report Number(s):
- CONF-930710-; CODEN: JOUSEH; TRN: 95-004023
- Journal Information:
- Journal of Superconductivity; (United States), Vol. 7:2; Conference: Physics and chemistry of molecular and oxide superconductors conference, Eugene, OR (United States), 27-31 Jul 1993; ISSN 0896-1107
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HIGH-TC SUPERCONDUCTORS
CRYSTAL LATTICES
ELECTRON MICROSCOPY
SPECTROSCOPY
TOPOGRAPHY
ABLATION
BARIUM OXIDES
CERAMICS
CRYOGENICS
CUPRATES
EXCIMER LASERS
OXIDES
THIN FILMS
TUNNEL EFFECT
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
FILMS
GAS LASERS
LASERS
MICROSCOPY
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
360204 - Ceramics
Cermets
& Refractories- Physical Properties
400102 - Chemical & Spectral Procedures
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies