${}^{111}\mathrm{Cd}$ and ${}^{113}\mathrm{Cd}$ spin-lattice relaxation in $\mathrm{Cd}\mathrm{Mo}{\mathrm{O}}_4$ by paramagnetic centers in the absence of spin diffusion

In an ongoing effort to understand the solid-state spin-lattice relaxation mechanism and its modulation for heavy-nuclei spin-$1∕2$ systems like ${}^{207}\mathrm{Pb}$ and ${}^{203}\mathrm{Tl}∕{}^{205}\mathrm{Tl}$, we have serendipitously observed that the recovery of a saturated ${}^{111}\mathrm{Cd}$ (or ${}^{113}\mathrm{Cd}$) nuclear magnetization in $\mathrm{Cd}\mathrm{Mo}{\mathrm{O}}_4$ shows the three distinct time regions elucidated by Bodart et al. [Phys. Rev. B 54, 15291 (1996)] when nuclear-spin relaxation is dominated by paramagnetic impurity relaxation in the complete absence of nuclear-spin diffusion.

Figure 1

${}^{111}\mathrm{Cd}$ saturation recovery in $\mathrm{Cd}\mathrm{Mo}{\mathrm{O}}_4$. One datum, $M=0.00\pm 0.03$ at $t=0.01\mathrm{s}$, is not shown.