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Title: Surface of underdoped YBa2Cu3O7- δ as revealed by STM/STS
Authors: Urbanik, G.Hänke, T.Hess, C.Büchner, B.Ciszewski, A.Hinkov, V.Lin, C. T.Keimer, B.
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Issue Date: 2009
Published in: The European Physical Journal B, Volume 69, Page 483-489
Publisher: London : BioMed Central
Abstract: We performed scanning tunneling microscopy and spectroscopy on untwinned crystals of underdoped YBa2Cu3O7- δ at δ = 0.4. A comprehensive statistical analysis of our topographic data indicates a doping dependent cleaving behavior of this material. We find in particular that at δ = 0.4 the material primarily cleaves in multiples of one unit cell along the c-axis with a high corrugation of the topmost layer. Our data suggest that the low temperature cleaving mainly results in a disruption of the CuO chain layers involving a redistribution of the layer atoms onto the two cleaving planes. In a few instances, fractional step heights (in terms of the c-axis lattice constant) are observed as well. Scanning tunneling spectroscopy reveals that such fractional steps connect surfaces which differ significantly in their tunneling conductance.
Keywords: Cell membranes; Copper oxides; Scanning; Scanning tunneling microscopy; Spectroscopy
DDC: 530
License: CC BY 3.0 Unported
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Appears in Collections:Physik

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