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Very recently, there has been significant progress with establishing a commonphenomenology of the superconducting cuprates in terms of nuclear magneticresonance (NMR) shift and relaxation. Different from the old interpretation, itwas shown that the shifts demand two coupled spin components with differenttemperature dependencies. One spin component couples isotropically to theplanar Cu nucleus and is likely to reside at planar O, while the other,anisotropic component has its origin in the planar copper $3d(x^2-y^2)$orbital. Nuclear relaxation, on the other hand, was found to be ratherubiquitous and Fermi liquid-like for planar Cu, i.e., it is independent ofdoping and material, apart from the sudden drop at the superconductingtransition temperature, $T_{\rm c}$. However, there is a doping and materialdependent anisotropy that is independent on temperature, above and below$T_{\rm c}$. Here we present a slightly different analysis of the shifts thatfits all planar Cu shift data. In addition we are able to derive a simple modelthat explains nuclear relaxation based on these two spin components. Inparticular, the only outlier so far, \lsco, can be understood, as well. Whilethis concerns predominantly planar Cu, it is argued that the two componentmodel should fit all cuprate shift and relaxation data.

NMR shift and relaxation and the electronic spin of superconducting cuprates