paper

Simultaneous Transitions in Cuprate Momentum-Space Topology and Electronic Symmetry Breaking

arXiv:1403.7788 · doi:10.1126/science.1248783

Abstract

The existence of electronic symmetry breaking in the underdoped cuprates, and its disappearance with increased hole-density , are now widely reported. However, the relationship between this transition and the momentum space (-space) electronic structure underpinning the superconductivity has not been established. Here we visualize the =0 (intra-unit-cell) and 0 (density wave) broken-symmetry states simultaneously with the coherent -space topology, for BiSrCaCuO samples spanning the phase diagram 0.060.23. We show that the electronic symmetry breaking tendencies weaken with increasing and disappear close to =0.19. Concomitantly, the coherent -space topology undergoes an abrupt transition, from arcs to closed contours, at the same . These data reveal that the -space topology transformation in cuprates is linked intimately with the disappearance of the electronic symmetry breaking at a concealed critical point.

Journal reference added. Main materials: 13 pages, 4 figures. Supplementary materials: 18 pages, 9 figures

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