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A Theoretical Study on the Spin-Hamiltonian Parameters for Samarium(III) Ion in Potassium Yttrium Tungstate Crystal

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A Theoretical Study on the Spin-Hamiltonian Parameters for Samarium(III) Ion in Potassium Yttrium Tungstate Crystal

Wei-Qing Yanga,b, Wen-Chen Zhengb, Ping Sub, and Hong-Gang Liub

aDepartment of Optics and Electronics, Chengdu University of Information Technology, Chengdu 610225, P. R. China

bDepartment of Material Science, Sichuan University, Chengdu 610064, P. R. China Reprint requests to W.-Q. Y.; E-mail: cdywq@cuit.edu.cn

Z. Naturforsch.66a,139 – 142 (2011); received March 5, 2010

The nine spin-Hamiltonian (SH) parameters (g-factorsgiand hyperfine structure constants147Ai

and149Aifor147Sm3+and149Sm3+isotopes, wherei=x,y,z) for the Samarium(III) ion in mono- clinic potassium yttrium tungstate [KY(WO4)2] crystal are calculated within the rhombic symmetry approximation from a diagonalization of energy matrix method. Differing from the conventional diag- onalization method used in the calculation of crystal-field levels, in the present method, we attach the Zeeman (or magnetic) and hyperfine interaction terms to the conventional Hamiltonian and construct the 66×66 energy matrix for 4f5ions in rhombic crystal field and under an external magnetic field by considering all the ground-term multiplets 4HJ. The calculated results are in reasonable agreement with the experimental values.

Key words:Electron Paramagnetic Resonance (EPR); Crystal Field Theory; Diagonalization Method; KY(WO4)2; Sm3+.

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