Polarization Selection Rules and Superconducting Gap Anisotropy in $Bi_2Sr_2CaCu_2O_8$

Details Polarization Selection Rules and Superconducting Gap Anisotropy in $Bi_2Sr_2CaCu_2O_8$ Polarization Selection Rules and Superconducting Gap Anisotropy in $Bi_2Sr_2CaCu_2O_8$

1995-07-07

arxiv.org/abs/cond-mat/9507021v1

Phys Rev B 52, 15107 (1995)

Physics

Condensed Matter

3 pages, revtex, 3 uuencoded postscript figures

Scientific paper

10.1103/PhysRevB.52.15107

We discuss polarization selection rules for angle-resolved photoemission spectroscopy in Bi2212. Using these we show that the ``hump'' in the superconducting gap observed in the $X$ quadrant in our earlier work is not on the main $CuO_2$ band, but rather on an umklapp band arising from the structural superlattice. The intrinsic gap is most likely quite small over a range of $\pm 10^\circ$ about the diagonal directions.

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