A theoretical investigation of the spin-Hamiltonian parameters for Dy3+ ion in CaWO4 crystal

✍ Scribed by Wei-Qing Yang; Wen-Chen Zheng; Hong-Gang Liu; Ping Su

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 118 KB
• Volume: 405
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2010.06.025

✦ Synopsis

The spin-Hamiltonian parameters, g factors g J and g ? and hyperfine structure constants 161 A J , 161 A ? , 163 A J and 163 A ? , for Dy 3 + ion at the tetragonal (S 4 ) Ca 2 + site of CaWO 4 crystal are calculated from a diagonalization (of energy matrix) method. In the method, the Zeeman (or magnetic) and hyperfine interaction terms are included in the Hamiltonian, and the 66 Â 66 energy matrix (note: the crystal-field energy levels can also be obtained by diagonalizing the matrix) corresponding to the ground-term states 6 H J (where J¼ 15/2, 13/2, 11/2, 9/2, 7/2 and 5/2) for 4f 9 ion in tetragonal crystal field and under an external magnetic field is established. In the matrix, the free-ion parameters are taken as the mean values obtained for Dy 3 + ions in many crystals and the crystal-field parameters B kq are those obtained from the optical spectra of CaWO 4 :Dy 3 + . The calculated results are close to the experimental values.