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Hong DingUniversity of Illinois ChicagoM. R. NormanMaterials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 and Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607J. C. CampuzanoMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 and Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607Mohit RanderiaTata Institute of Fundamental Research, Bombay - 400005, IndiaA. F. BellmanMaterials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 and Dipartimento di Fisica, Universita di Milano, 20133 Milano, ItalyT. YokoyaMaterials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 and Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607T. TakahashiMaterials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 and Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607T. MochikuNational Research Institute for Metals, Sengen, Tsukuba, Ibaraki 305, JapanK. KadowakiMaterials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 and Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607
1996lv
ABI
Annotatsiya
We report measurements of the momentum dependence of the superconducting gap in ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8+x}$ with angle-resolved photoemission spectroscopy using a dense sampling of the Brillouin zone in the vicinity of the Fermi surface. In the $Y$ quadrant of the zone, where there are no complications from ghost bands caused by the superlattice, we find a gap function consistent within error bars to the form $cos({k}_{x})\ensuremath{-}cos({k}_{y})$ expected for a $d$-wave order parameter. Similar results are found in the $X$ quadrant with the photon polarization chosen to enhance main band emission over that due to ghost bands.
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