Periodic density-of-states modulations in superconducting Bi2Sr2CaCu2O8+σ

C. Howald, H. Eisaki, N. Kaneko, M. Greven, A. Kapitulnik

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Abstract

In this paper we show, using scanning tunneling spectroscopy, the existence of static striped density of electronic states in nearly optimally doped Bi2Sr2CaCu2O8+σ in zero field. The observed modulation is strongest at roughly half the superconducting 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., a 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.

Original languageEnglish (US)
Article number014533
Pages (from-to)145331-1453310
Number of pages1307980
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number1
StatePublished - Jan 1 2003

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