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We report a systematic nuclear magnetic resonance investigation of the$^{23}$Na spin-lattice relaxation rate, $1/T_1$, in sodium loaded low-silica X(LSX) zeolite, Na$_n$/Na$_{12}$-LSX, for various loading levels of sodium atoms$n$ across the metal-to-insulator crossover. For high loading levels of $n \geq14.2$, $1/T_1T$ shows nearly temperature-independent behavior between 10 K and25 K consistent with the Korringa relaxation mechanism and metallic groundstate. As the loading levels decrease below $n \leq 11.6$, the extracteddensity of states (DOS) at the Fermi level sharply decreases, although aresidual DOS at Fermi level is still observed even in samples that lack themetallic Drude-peak in the optical reflectance. The observed crossover is aresult of a complex loading-level dependence of electric potential felt by theelectrons confined to zeolite cages, where the electronic correlations anddisorder both play an important role.

Evolution of the density of states at the Fermi level across the metal-to-insulator crossover in alkali doped zeolite