Periodic density-of-states modulations in superconducting Bi_{2}Sr_{2}CaCu_{2}O_{8+d}

By C. Howald, H. Eisaki, N. Kaneko, M. Greven, A. Kapitulnik. 2002

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In this paper we show, using scanning tunneling spectroscopy, the existence of static striped density of electronic states in nearly optimally doped Bi 2 Sr 2 CaCu 2 O 8 + δ 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.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/31defd9ae7b43ce377b9371da8c15a33430d8284

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In Atomic and Molecular Physics, and Optics

In Condensed Matter Physics

In Electronic, Optical and Magnetic Materials

S. Sachdev

Citations in the corpus

Order and quantum phase transitions in the cuprate superconductors (2002, background): “The possible signals of bond order in a superconductor at H = 0 in the STM observations of Howald et al. (Howald et al., 2003, 2002), may be related to the B+SC phase along the line β in Fig 13; similarly, the observations of Hoffman et al. (Hoffman et al., 2002a) at H 6= 0 can be interpreted by…”