Nuclear resonance studies of YBa2Cu3O7-δ

The copper oxide high-Tc superconductors have proven to be a challenging area of investigation for many condensed matter experimentalists and nuclear resonance investigators. In spite of a successful history of NMR and NQR studies of metallic solids, surprising and unprecedented behavior found with these techniques continues to fascinate workers in the field of high-Tc superconductors. Recent work on optical Raman scattering and neutron diffraction studies has made it clear that magnetism associated with the copper sites plays a major role in the properties of these systems. Nuclear resonance provides an excellent local probe of both the static and dynamic magnetic properties. In this paper the authors present and discuss some recent NMR and NQR results obtained on the family of compounds YBa2Cu3O7-δ(YBCO). This system continues to attract a great deal of attention not only because it was the first liquid nitrogen superconductors, but also because it can be synthesized in both ceramic and single crystal form with the high quality and highly controlled microscopic properties necessary for research