Abstract
The authors review evidence, from NMR of 63Cu and 17O atoms in the CuO planes, concerning the spin and orbital pairing of the superconductor YBa 2Cu 3O 7. It shows that the NMR data in the superconducting state require a spin-singlet pairing state. It is consistent with orbital d-wave pairing, but not with a conventional orbital s-wave pairing. Whether or not other types of orbital pairing states (e.g. anisotropic s-state) can explain the data can only be judged when those theories are used to calculate the NMR properties.
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