Spin Relaxation Process of Chromium Ion in Potassium Alum

摘要

The electron spin relaxation process of potassium chrome alum and potassium chrome aluminum alum was investigated at 14.5 GHz by measuring the change in the static dc magnetization as a function of the cw microwave power absorbed at electron resonance. At liquidhyphen;helium temperatures, the direct spinndash;lattice relaxation process is the dominant ratehyphen;determining process for magnetically dilute potassium chrome aluminum alum, but for the magnetically concentrated crystals, the spinndash;lattice process can easily be obscured by the latticendash;bath relaxation process. The spinndash;lattice relaxation measurements at 14.5 GHz and those of other workers at 9 GHz are in agreement with the calculations made by Van Vleck in 1940.