Abstract
The electron spin resonance study of Nd3+ in cadmium sulfide single crystal has been done at 1.4°K and X-band. The observed spectra consist of a strong line due to even isotopes and satellite lines coming from the hyperfine interaction with nuclei of odd isotopes. They can be explained by using the spin Hamiltonian, \mathscrH=g⁄⁄βHzSz+g⊥β(HxSx+HySy)+AIzSz+B(IxSx+IySy) where the c-axis of the crystal is chosen as the z-axis. The parameters are g⁄⁄=0.43±0.05, g⊥=3.409±0.005, |B|=(342±5)×10−4 cm−1 for 143Nd, and |B|=(213±3)×10−4 cm−1 for 145Nd. The crystal field around Nd3+ in cadmium sulfide has the symmetry of C3v. The ground state (4I9⁄2) splits into five doublets by this crystal field. Judd’s theory of Nd3+ in double nitrate is applied to this case to discuss the ground state of Nd3+ in cadmium sulfide. The ground state wave function is constructed as a linear combination, 0.2490|9⁄2, \mp5⁄2>±0.9685|9⁄2, ±1⁄2>. Besides Nd3+ resonance lines, several lines have been observed. Paramagnetic centers which are responsible for these lines are discussed.
