Superconducting Gap and Strong In-Plane Anisotropy in Untwinned YBa2Cu3O7-d

Details Superconducting Gap and Strong In-Plane Anisotropy in Untwinned YBa2Cu3O7-d Superconducting Gap and Strong In-Plane Anisotropy in Untwinned YBa2Cu3O7-d

2001-03-02

arxiv.org/abs/cond-mat/0103047v1

Physics

Condensed Matter

Superconductivity

Phys. Rev. Lett., in press. Revtex, 4 pages, 4 postscript figures embedded in the text

Scientific paper

10.1103/PhysRevLett.86.4370

With significantly improved sample quality and instrumental resolution, we clearly identify in the (pi,0) ARPES spectra from YBa2Cu3O6.993, in the superconducting state, the long-sought `peak-dip-hump' structure. This advance allows us to investigate the large a-b anisotropy of the in-plane electronic structure including, in particular, a 50% difference in the magnitude of the superconducting gap that scales with the energy position of the hump feature. This anisotropy, likely induced by the presence of the CuO chains, raises serious questions about attempts to quantitatively explain the YBa2Cu3O7-d data from various experiments using models based on a perfectly square lattice.

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