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Scanning tunneling spectroscopy is used to study the dispersive wave vectors of the local-density-of-states modulations in near-optimal Bi_2Sr_2CaCu_2O_{8+δ}. Atomic-resolution energy-resolved spectroscopic images are acquired in a 650Å field of view on the BiO cleave surface of these crystals at 4.2 K. Fourier transforms are used to measure the wave vectors of spatial modulations in the local density...
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