- Autor(in)
- Sponsor(in)
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Deutschland. Bundesministerium für Forschung und Technologie
- Referenz
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- Seitenbereich
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0575 - 0583
- Schlagwort(e)
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<KWD>Tunneling microscopy
Superconductivity
Surface modification
- Zusammenfsg.
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The surface of YbBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> single crystals was investigated using a scanning tunneling microscope at room temperature in air. Growth steps with step heights equal to the lattice parameter <I>c</I> as well as steps with step heights of multiples of 1.35 c were obtained. On smooth surfaces atoms arranged in a 3.8 Å square lattice could be resolved. We observed a tunneling-induced etching effect leading to an etch pit on the surface. Furthermore, by applying voltage pulses with amplitude > 5.0 V and duration > 100 μs holes with diameters of 150 nm could be produced. Scanning tunneling spectroscopic measurements were performed yielding <I>I-V</I> and ln <I>I-s</I> characteristics. The extremely small effective barrier height of Φ = 0.3 eV inferred from <I>d</I> ln <I>I/ds</I> may be caused by dirt between the surface and the tip.
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