Microscopic theory of NMR in an anisotropic superfluid (He3A)

Equations are derived for the motion of the magnetization and the "spin axes of the Cooper pairs," and solved for the case of unsaturated cw resonance. In general two discrete resonances are predicted, but if a special condition is met, only one occurs. The complete field dependence of the line(s) determines the gap configuration almost uniquely. The predictions are consistent with existing data and in strong conflict with Anderson's theory.