Spin-lattice relaxation of Nd_+ in CaF_ at 4.2K
Ching, Ronald Kai Shing
Donoho, Paul L.
Master of Arts
The spin-lattice relaxation time T1 of Nd3+ in CaF2 at 4.2 K has been measured as a function of the angle , between the external magnetic field and the crystal 100 axis. The data are analysed in terms of the magnetic field dependence to determine which of the three processes , the direct one-phonon, the Raman and the Orbach, dominates at 4.2 K. the relaxation time of the Orbach and Raman processes altogether is about 1.7 times shorter than that of the direct process. As decreases the relaxation due to the direct process becomes less and less important.