Empirical relation of nuclear magnetic relaxation and specific heat in heavy fermion compounds

Nuclear magnetic relaxation rate of many heavy fermion compounds obey (T1T)-1 = constant relation, so called Korringa relation. This constant is largely enhanced due to large density of states at Fermi level. However very little quantitative discussion on the enhancement of (T1T)-1 have been done except YbAl2 and YbAl3. In this paper, (T1T)-1 of many heavy fermion compounds, including those of YbAs and CePdAl which have been reported in our recent papers, are compared with Korringa constant for a single impurity Anderson model. The correlation between γ value of specific heat and the deviation from Korringa constant for a single impurity Anderson model is pointed out. (author)