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2001 (2)
2000 (1)
1Author    Shao-Yi Wu, Wen-Chen ZhengRequires cookie*
 Title    Spin-lattice Coupling Coefficient G ^ of KMgF3:Mn2+ Calculated from Two Cases  
 Abstract    The high (fourth) order perturbation formulas based on the dominant spin-orbit coupling mech­ anism for the zero-field splittings D m of a 6S-state ion in trigonal symmetry and E [ha in rhombic symmetry are derived from the strong field scheme. Two analytic expressions of the spin-lattice coupling coefficient G 4 4 obtained from the formulas of and E rho are established by using a simple and uniform method. Based on the two expressions, the coefficients G 4 4 for KMgF3:Mn2+ are calculated in two cases. The results show that the lowest (third) order perturbation formulas of and E ^ 0 are too simple and too approximate to give reasonable and consistent values of G 44, whereas when the fourth-order perturbation terms D (^ and E ^ 0 are considered, the calculated values of G 44 (= G 44 + G '^) 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. 
  Reference    Z. Naturforsch. 56a, 253—256 (2001); received November 28 2000 
  Published    2001 
  Keywords    Spin-lattice Coupling Coefficient, Electron Paramagnetic Resonance (EPR), Crystal-field Theory, Mn2+, KMgF3 PACS: 7630Fc, 7170Ch 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0253.pdf 
 Identifier    ZNA-2001-56a-0253 
 Volume    56 
2Author    Wen-Chen Zheng, Shao-Yi WuRequires cookie*
 Title    Studies of the Local Phase-transition Behaviour for Ni + -II Centers in RbCaF 3 Crystal from EPR Data  
 Abstract    By fitting the calculated EPR g,(i = JC, y, z) factors to the observed values, the local release factor which is introduced to characterize the release (or elongation) effect of impurity-ligand bonds along the rotational axis in the cubic-to-tetragonal phase transition of ABX 3 perovskites, is obtained for the Ni + -II center in RbCaF 3 crystal. The result shows that, similar to the local rotational angle (or order param-eter) (p, the local release factor is unlike that of the host crystal. It suggests that in the doped crystal the impurity can affect the local phase transition behaviour in the vicinity of impurity ions. 
  Reference    Z. Naturforsch. 55a, 915—917 (2000); received September 12 2000 
  Published    2000 
  Keywords    Local Phase Transition Behaviour, E P R, Crystal-field Theory, Ni + ion, RbCaF 3 PACS: 6470Kb, 7630Fc, 7170Ch 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0915.pdf 
 Identifier    ZNA-2000-55a-0915 
 Volume    55 
3Author    Shao-Yi Wu, Wen-Chen ZhengRequires cookie*
 Title    Investigations of the EPR Parameters and Local Structures for Two Tetragonal Cr3* Centers in NH4C1 Crystal  
 Abstract    In this paper, the zero-field splittings D and g factors g», g± at room temperature for two tetragonal Cr3+ centers in NH4Cl:Cr3+ crystal have been investigated by a two-spin-orbit (S.O)-parameter model, in which both the contribution due to the S.O. coupling of central d3 ion and that of ligands are considered. From the investigations, the signs of zero-field splitting and the local structures of both centers are ob­ tained. The electron paramagnetic resonance parameters D, g^ and g± of both centers are also explained. 
  Reference    Z. Naturforsch. 56a, 326—3 (2001); received February 1 2001 
  Published    2001 
  Keywords    Spin-orbit Coupling, Electron Paramagnetic Resonance (EPR), Crystal-field Theory, Cr3+, NH4CI4 PACS: 7630Fc, 7170Ch 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0326.pdf 
 Identifier    ZNA-2001-56a-0326 
 Volume    56