Abstract
The spin-lattice relaxation time for the $M=\ensuremath{-}\frac{1}{2}\ensuremath{\rightarrow}\frac{1}{2}$ transition of trivalent iron in single-crystal calcite has been measured at $X$ band by pulse recovery from 1.4 to 45 K and by spectral line broadening from 40 to 195 K. The resulting transition-probability data are well described by the sum of a direct-process term and a Raman-process term, the latter having a ${T}^{5}$ dependence in its low-temperature regime. An effective Debye temperature of $\ensuremath{\Theta}=463\ifmmode\pm\else\textpm\fi{}5$ K is obtained as a best-fit parameter for the Raman process.
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