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Investigations of the EPR g Factors for Er

3+

in CaMoO

4

Shao-Yi Wua,b, Hui-Ning Dongb,c, and Wang-He Weia

aDepartment of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

bInternational Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, P. R. China

cCollege of Electronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China

Reprint requests to S.-Y. W; E-mail: shaoyi wu@163.com Z. Naturforsch. 59a, 341 – 345 (2004); received March 25, 2004

The electron paramagnetic resonance (EPR) g factors gand g⊥for Er3+in CaMoO4are theo- retically investigated by using the perturbation formulas of the g factors for a 4f11ion in tetragonal symmetry. In these formulas, the contributions to the g factors arising from the second-order pertur- bation terms and the admixture of various states are considered. The crystal-field parameters for the tetragonally distorted tetrahedra are determined by using the superposition model and the structural data of the impurity Er3+on the host Ca2+site in CaMoO4. The calculated g factors agree with the observed values. The validity of the results is discussed.

Key words: Electron Paramagnetic Resonance (EPR); Crystal- and Spin Hamiltonians; Er3+; CaMoO4.

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c Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054,