Pure dx2 – y2 order-parameter symmetry in the tetragonal superconductor TI2Ba2CuO6+δ

@article{Tsuei1997PureD,
  title={Pure dx2 – y2 order-parameter symmetry in the tetragonal superconductor TI2Ba2CuO6+$\delta$},
  author={Chang C. Tsuei and John R. Kirtley and Zhi Feng Ren and Jianghao Wang and H'elene Raffy and Zhuo Zhe Li},
  journal={Nature},
  year={1997},
  volume={387},
  pages={481-483}
}
Crucial to the successful development of a theoretical model for high-temperature superconductivity is knowledge of the symmetry of the order parameter (or wavefunction) that describes the pairing of electrons in the superconducting state. Several experimental studies1–8 provide convincing evidence for an anisotropic order parameter, consistent with a dx2– y2 symmetry. But none of these earlier experiments could rule out unambiguously an additional contribution from isotropic s-wave pairing… Expand
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