Nuclear spin relaxation due to order director fluctuations in the smectic A phase

The frequency dispersion and anisotropy of nuclear spin relaxation caused by order director fluctuations in the smectic A phase are calculated. Dispersion of (T−11)OF at low frequencies, which departs from the nematic-like behavior, is examined in detail and the influence of the wave vector dependent viscosity coefficients on relaxation is commented. The deviation from the nematic-like relaxation behavior drastically changes the angular dependence of (T−11ρ)OF.