Topography and local conductance images of YBa2Cu3O7 crystals fractured in ultra high vacuum
作者： C.J. Chen , C.C. Tsuei
DOI: 10.1016/0038-1098(89)90167-1
关键词: Electrical resistivity and conductivity 、 Quantum tunnelling 、 Scanning tunneling microscope 、 Ultra-high vacuum 、 Chemistry 、 Scanning electron microscope 、 Conductance 、 Condensed matter physics 、 Density of states 、 High-temperature superconductivity 、 Optics
摘要: Abstract Atomic-scale topography and local dynamic conductance images of polycrystalline YBa2Cu3O7 samples fractured in ultra high vacuum are obtained with a cross-sectional scanning tunneling microscope. Topographic features found which consist strips 12 A periodicity. Simultaneous measurements normalized (d In I/dV) on these surfaces exhibit sharp contrast from strip to strip. The corresponding spectra at areas show an alternation metallic semiconducting characteristics. Possible implication the results basic understanding temperature superconductivity is discussed.
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