Abstract

The lecture presents examples of Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR) studies performed in compounds of the Y-Ba-Cu-O family in order to show the kind of information these microscopic techniques can provide with respect to structural and electronic properties. Topics which are addressed are the following: calculation of electric field gradients; valences and bonding and temperature and pressure effects; oxygen distribution; doping with cations; Knight shifts and relaxation times and their relations to hole concentration, one-component susceptibilities, coupling of planes, spin-gap and BCS orbital-pairing.

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