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Energy Level Spectra of Transition Metal Ions In Diluted Magnetic Semiconductors

Published online by Cambridge University Press:  21 February 2011

Murielle Villeret ,
S. Rodriguez  and
E. Kartheuser
Murielle Villeret
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907
S. Rodriguez
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907
E. Kartheuser
Affiliation:
Institut de Physique, Université de Liège, B-4000 Liege, Belgium
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Abstract

We present a study of the low lying energy levels of Fe2+, Co2+, Ni2+ and Cu2+ in diluted magnetic semiconductors such as Cd1−xCoxTe and Cd1−xCoxSe and their counterparts. In the first of these compounds the magnetic ion sits on a site of symmetry Td while in the second the symmetry is trigonal (C3v). We develop a formulation that permits a continuous variation from Td to C3v symmetry. Comparison with experimental data in Cd1−xCoxSe shows that the C3v distortion amounts to about 10% of the crystal potential at the Co2+ site. Our study of the energy spectra of Fe2+ in Td and C3v crystal potentials reveals that, even in the cubic field, the levels exhibit an anisotropy which manifests it- self in an anisotropy of the magnetization, , in the regime in which is not a linear function of the magnetic field . The study includes all the levels in the lowest terms of the (3d)n (n=6,7,8,9) configurations. The calculations are carried out to second order in the spin-orbit interaction and in for the lowest orbital states and to first order in for the excited states. The g-factors of all the levels are obtained including their anisotropy for the Co2+ and Cu2+Γ8states.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 161: Symposium E – Properties of II-VI Semiconductors: Bulk Crystals, Epitaxial Films, Quantum Well Structures, and Dilute Magnetic Systems , 1989 , 491
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1. Diluted Magnetic Semiconductors in Semiconductors and Semimetals, vol. 25, edited by Furdyna, J.K. and Kossut, J. (Academic, Boston, 1988).Google Scholar
2. Villeret, M., Rodriguez, S. and Kartheuser, E., Physica B (to be published).Google Scholar
3. Villeret, M., Ph.D. Thesis, Purdue University, 1989.Google Scholar
4. The group theoretical notation for the point groups and the irreducible representations follows Koster, G.F., Dimmock, J.O., Wheeler, R.G. and Statz, H., Properties of the Thirty-Two Point Groups (M.I.T. Press, Cambridge, MA, 1966).Google Scholar
5. Abragam, A. and Bleaney, B., Electron Paramagnetic Resonance of Transition Ions (Clarendon Press, Oxford, 1970).Google Scholar
6. Mahoney, J.P., Lin, C.C., Brumage, W.H. and Dorman, F., J. Chem. Phys. 53, 4286, 1970.Google Scholar
7. Lewicki, A. (private communication).Google Scholar