2009, Schmidt, Oliver G., Mei, Y.F., Huang, G.S., Solovev, A.A., Bermudez Urena, E., Mönch, I., Bolanos, V., Ding, F., Reindl, T., Kiravittaya, S.

[no abstract available]

2009, Urbanik, G., Hänke, T., Hess, C., Büchner, B., Ciszewski, A., Hinkov, V., Lin, C.T., Keimer, B.

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.

2005, IFW

[no abstract available]

2009, Leonhardt, Albrecht, Ritschel, Manfred

[no abstract available]

2008, Hoffmann, V.

[no abstract available]

2009, Büchner, Bernd

[no abstract available]

2005, Handstein, A.

[no abstract available]