Physics – Condensed Matter – Superconductivity
Scientific paper
2007-08-17
Phys. Rev. Lett 101, 047002 (2008)
Physics
Condensed Matter
Superconductivity
Accepted by Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.101.047002
We present angle-resolved photoemission spectroscopy (ARPES) data on moderately underdoped La$_{1.855}$Sr$_{0.145}$CuO$_4$ at temperatures below and above the superconducting transition temperature. Unlike previous studies of this material, we observe sharp spectral peaks along the entire underlying Fermi surface in the superconducting state. These peaks trace out an energy gap that follows a simple {\it d}-wave form, with a maximum superconducting gap of 14 meV. Our results are consistent with a single gap picture for the cuprates. Furthermore our data on the even more underdoped sample La$_{1.895}$Sr$_{0.105}$CuO$_4$ also show sharp spectral peaks, even at the antinode, with a maximum superconducting gap of 26 meV.
Bendounan Azzedine
Campuzano Juan-Carlos
Chang Jaewan
Claesson T.
Ido M.
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