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Charge Order Driven by Fermi-Arc Instability in Bi2 S2–x La x CuO6+δ

Science  19 Dec 2013:

DOI: 10.1126/science.1242996

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Abstract

An understanding of the nature of superconductivity in cuprates has been hindered by the apparent diversity of intertwining electronic orders in these materials. Here we combine resonant X-ray scattering (REXS), scanning-tunneling microscopy (STM), and angle-resolved photoemission spectroscopy (ARPES) to observe a charge order that appears consistently in surface and bulk, and momentum and real spacewithin one cuprate family, BiEmbedded ImageSrEmbedded ImageLaEmbedded ImageCuOEmbedded Image. The observed wavevector rules out simple antinodal nesting in the single particle limit, but matches well with a phenomenological model of a many-body instability of the Fermi arcs. Combined with earlier observations in other cuprate families, these findings suggest the existence of a generic charge-ordered state in underdoped cuprates, and uncover its connection to the pseudogap regime.

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