ISSN:
1572-9605
Keywords:
Scanning tunneling microscopy
;
YBa2Cu3Oy
;
laser-ablated thin films
;
tunneling spectroscopy
;
superconducting energy gap
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The topographic and electronic properties of the surfaces of (001) and (110) oriented YBa2Cu3Oy, 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 CuO2 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00724567
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