Anomalous Larmour Frequency Dependence of Proton Spin-Lattice Relaxation   Time (T$_1$) in the Ferroelectric Glycine Phosphite
  We report here the results of $^1$H NMR spin-lattice relaxation time (T$_1$) studies in Glycine phosphite which is a ferroelectric below 224 K. The experiments have been carried out in the temperature range from 200 K to 419 K and at two Larmour frequencies of 11.40MHz and 23.56 MHz. We have noticed a Larmour frequency dependence on the high temperature side of the T$_1$ minimum >. A model is proposed based on the BPP theory to explain the observation. 
R. Kannan, K. P. Ramesh and J. Ramakrishna (Physics Dept, IISC,   Bangalore)