# Symmetry of the order parameter in the high-Tc superconductor YBa2Cu3O7- δ

@article{Kirtley1995SymmetryOT,
title={Symmetry of the order parameter in the high-Tc superconductor YBa2Cu3O7- $\delta$},
author={John R. Kirtley and Chang C. Tsuei and J. Z. Sun and Cheng Chung Chi and Lock See Yu-Jahnes and Anurag Gupta and Matthias Rupp and Mark B. Ketchen},
journal={Nature},
year={1995},
volume={373},
pages={225-228}
}
RECENT discussions of the mechanism of high-temperature superconductivity have focused on the symmetry of the superconducting order parameter (the wavefunction of the superconducting state) as a means of constraining the nature of the interaction that forms the Cooper pairs1,2. There have been many attempts to measure the symmetry of this parameter in the high-temperature superconductor YBa2Cu3O7 - δ (refs 3–10), but they have not yielded consistent results. Here we show that half-integer flux… Expand
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