The high (fourth) order perturbation formulas based on the dominant spin-orbit coupling mechanism for the zero-field splittings D-tri of a S-6-state ion in trigonal symmetry and E-rho in rhombic symmetry are derived from the strong field scheme. Two analytic expressions of the spin-lattice coupling coefficient G(44) Obtained from the formulas of D-tri and E-rho are established by using a simple and uniform method. Based on the two expressions, the coefficients G(44) for KMgF3:Mn2+ are calculated in two cases. The results show that the lowest (third) order perturbation formulas of D-tri((3)) and E-rho((3)) are too simple and too approximate to give reasonable and consistent values of G44, whereas when the fourth-order perturbation terms D-tri((4)) and E-rho((4)) are considered, the calculated values of G(44) (= G(44)((3)) + G(44)((4))) in both cases are not only close to each other, but also in agreement with the observed value. So, the fourth-order perturbation terms cannot be neglected.
部门归属
sichuan univ, dept mat sci, chengdu 610064, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china.;wu, sy (reprint author), sichuan univ, dept mat sci, chengdu 610064, peoples r china
S. Y. Wu,W. C. Zheng. Spin-lattice coupling coefficient G(44) of KMgF3 : Mn2+ calculated from two cases[J]. Zeitschrift Fur Naturforschung Section a-a Journal of Physical Sciences,2001,56(3-4):253-256.
APA
S. Y. Wu,&W. C. Zheng.(2001).Spin-lattice coupling coefficient G(44) of KMgF3 : Mn2+ calculated from two cases.Zeitschrift Fur Naturforschung Section a-a Journal of Physical Sciences,56(3-4),253-256.
MLA
S. Y. Wu,et al."Spin-lattice coupling coefficient G(44) of KMgF3 : Mn2+ calculated from two cases".Zeitschrift Fur Naturforschung Section a-a Journal of Physical Sciences 56.3-4(2001):253-256.
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