Unambiguous evidence for extended s-wave pairing symmetry in hole-doped high-temperature superconductors
Abstract
We have analyzed data from angle resolved photoemission spectroscopy, Fourier transform scanning tunnelling spectroscopy, and low-temperature thermal conductivity for optimally doped Bi2Sr2CaCu2O8+y in order to discriminate between d-wave and extended s-wave pairing symmetry. The combined data are inconsistent with d-wave symmetry, but quantitatively consistent with extended s-wave symmetry with eight line nodes. We also consistently explain all the phase-sensitive experiments.
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