论文信息 - Superstripes by Anomalous X-Ray Diffraction and Angle Resolved Photoemission in BI2212

Superstripes by Anomalous X-Ray Diffraction and Angle Resolved Photoemission in BI2212

We show an evidence for the superconducting stripes (superstripes) in the Bi2212 system by joint x-ray diffraction and angle resolved photoemission. The kink observed at ky=0.4π in the energy distribution curves is shown to be related to a modulation of the Cu displacement out of the oxygen plane with a wavevector Q~(0.4π, 0.4π) that modulates the next-nearest neighbor hopping integral t′. The resulting Fermi surface reveals broken segments around the M points due to the modulation of the t′, associated with modulation of the electron-lattice coupling λ(e) that depends on the micro strain e of the CuO2 plane. The present findings further enlightens the fact that the micro-strain, controlling the electron-lattice coupling λ(e) is a critical parameter for the superstripes.

A. Bianconi | N. Saini

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