# Angle-resolved phase-sensitive determination of the in-plane gap symmetry in YBa2Cu3O7−δ

@article{Kirtley2006AngleresolvedPD,
title={Angle-resolved phase-sensitive determination of the in-plane gap symmetry in YBa2Cu3O7−$\delta$},
author={John R. Kirtley and Chang C. Tsuei and Ariando and C. J. M. Verwijs and S. Harkema and H. Hilgenkamp},
journal={Nature Physics},
year={2006},
volume={2},
pages={190-194}
}
AbstractUnderstanding the nature of the ground state and its low-lying excitations in the copper oxide superconductors is a prerequisite for determining the origin of high-temperature superconductivity. A superconducting order parameter (that is, the energy gap) with a predominantly dX2−Y2 symmetry is well-established. However, various deviations from a pure d-wave pair state, such as the possibility of Cooper pairing with broken time-reversal symmetry or an admixed dX2−Y2+s pair state, have… Expand
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