Schedule Aug 27, 2002
Inhomogeneities and Density of States Modulations in BSCCO
Dr. Aharon Kapitulnik, Stanford University
http://www.stanford.edu/group/kgb/
In this paper we show, using scanning tunneling spectroscopy (STS), the existence of stati striped density of electronic states in nearly optimally doped $Bi_2Sr_2CaCu_2O_{8+\delta}$ in zero field. The observed modulation is strongest at roughly half the gap energy and is aligned with the Cu-O bonds, with a periodicity of four lattice constants, exhibiting features characteristic of a two-dimensional system of line objects. These features also exhibit asymmetries between the two orthogonal directions locally, pointing to a possible broken symmetry state (i. e., stripe phase). We further show that the density of states modulation manifests itself as a shift of states from above to below the superconducting gap. The fact that a single energy scale (i. e., the gap) appears for both superconductivity and stripes suggests that these two effects have the same microscopic origin.

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