S Emura et al 2009 J. Phys.: Conf. Ser. 190 012102 doi:10.1088/1742-6596/190/1/012102
Broken symmetry of cage surrounding magnetic dopant Cr ion in cubic GaN
S Emura, K Tokuda, S Kobayashi, Y K Zhou, S Hasegawa and H Asahi
Show affiliationsThe X-ray absorption spectra around the Cr K-edge are observed to reveal the strange behaviour on the magnetism of the dilute magnetic semiconductor GaCrN with a cubic structure (F
3 m = Td2). The radial distribution function analyzed in the part of the X-ray absorption fine structure shows the splitting in the first and the second nearest neighbours into two peaks, indicating that the Cr ion substitutes the Ga ion but shifts from just the lattice site of the Ga ion. This local lattice instability breaking the symmetry is explained by pseudo-Jahn – Teller effect. In the relation to the local lattice instability, the electronic ground state of the Cr ion in the cubic GaN is discussed.
- PACS
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78.70.Dm X-ray absorption spectra
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Pp Magnetic semiconductors
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
- Subjects
- Dates
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Issue 1 (2009)
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Broken symmetry of cage surrounding magnetic dopant Cr ion in cubic GaN
S Emura et al 2009 J. Phys.: Conf. Ser. 190 012102
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