Electron Spin-Lattice Relaxation of Chromium in MgO

Abstract
The effective spin-lattice relaxation time, T1, has been observed for the ground-state multiplet of Cr(+3) in the cubic field of MgO. T1 is observed to vary from 800 milliseconds at 1.3° to 3.4 milliseconds at 50°K. The direct process dominates below 4.2°.