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'7170Ch' in keywords Facet   Publication Year 2001  [X]
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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    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