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Investigations of the g Factors of Fe

+

in MgO and CaO

Shao-Yi Wua,band Hui-Ning Dongb,c

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

bInternational Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, 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. 60a, 366 – 368 (2005); received January 25, 2005

The g factors of Fe+in MgO and CaO are theoretically investigated by the perturbation formula of the g factor of a 3d7ion in cubic octahedral symmetry based on the cluster approach. By considering the partial quenching of the spin-orbit coupling interaction and the effective Land´e factor due to the dynamic Jahn-Teller effect (DJTE), the experimental g factors of the studied systems are reasonably interpreted. It can be suggested that the small g factors of the Fe+centers in MgO and CaO can be likely attributed to the DJTE, rather than the covalency effect within the scheme of the static crystal- field model.

Key words: Electron Paramagnetic Resonance; Crystal- and Ligand-field Theory; Fe+; MgO; CaO.

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