$\beta$-Detected NMR of $^8$Li in the Normal State of 2H-NbSe$_2$
  $\beta$-NMR of isolated $^8$Li has been investigated in the normal state of 2H-NbSe$_2$. In a high magnetic field of 3T a single resonance is observed with a Gaussian line width of 3.5 kHz. The line shape varies weakly as function of magnetic field and temperature but has a strong orientation dependence. The nuclear electric quadrupole splitting is unresolved implying that the electric field gradients are 10-100 times smaller than in other non-cubic crystals. The nuclear spin relaxation rate is also anomalously small but varies linearly with temperature as expected for Korringa relaxation in a metal. These results suggest that Li adopts an interstitial position between the weakly coupled NbSe$_2$ layers and away from the conduction band. 
D. Wang, M.D. Hossain, Z. Salman, D. Arseneau, K.H. Chow, S. Daviel,   T.A. Keeler, R.F. Kiefl, S.R. Kreitzman, C.D.P. Levy,...