Dyson line and modified Dyson line in the EPR measurements

Popovych, Volodymyr; Bester, Mariusz; Stefaniuk, Ireneusz; Kuzma, Marian

doi:10.1515/nuka-2015-0068

Abstract

The difficulty in determining the electron paramagnetic resonance (EPR) line parameters of ferromagnetic semiconductors has been addressed. For these materials, the resonance line is very broad and lies at low resonance field, so that only a part of the line can be detected experimentally. Moreover, the line is of asymmetric (Dysonian) shape as described by the line shape parameter α. We have compared values of line parameters derived by computer fitting of the whole experimental EPR line to the Dyson function (or modified Dyson function) with the values obtained by applying this procedure to the left and the right half of the line.

References

1. Dyson, F. J. (1955). Electron spin resonance absorption in metals. II. Theory of electron diffusion and the skin effect. Phys. Rev., 98(2), 349–359.
Search in Google Scholar
2. Feher, G., & Kip, A. F. (1955). Electron spin resonance absorption in metals. I. Experimental. Phys. Rev., 98(2), 337–351. http://dx.doi.org/10.1103/PhysRev.98.337.
Search in Google Scholar
3. Webb, R. H. (1964). Electron-spin-resonance line shape in spherical metal particles. Phys. Rev., 158(2), 225–233. http://dx.doi.org/10.1103/Phys-Rev.158.225.
Search in Google Scholar
4. Joshi, J. P., & Bhat, S. V. (2004). On the analysis of broad Dysonian electron paramagnetic resonance spectra. J. Magn. Reson., 168(2), 284–287. DOI: 10.1016/j.jmr.2004.03.018.10.1016/j.jmr.2004.03.018
Search in Google Scholar
5. Blinowski, J. P., Kacman, J. A., & Majewski, J. (1996). Ferromagnetism in Cr-based diluted magnetic semiconductions. J. Cryst. Growth, 159(1/4), 972–975.10.1016/0022-0248(95)00719-9
Search in Google Scholar
6. Peter, M., Shaltiel, D., Wernick, J. H., Williams, H. J., Mock, J. B., & Sherwood, R. C. (1962). Paramagnetic resonance of S-state ions in metals. Phys. Rev., 126(4), 1395–1402. http://dx.doi.org/10.1103/PhysRev.126.1395.
Search in Google Scholar
7. Burgardt, P., & Seehra, M. S. (1977). Electron paramagnetic resonance in gadolinium near T_C. Phys. Rev. B, 16(5), 1802–1807. http://dx.doi.org/10.1103/PhysRevB.16.1802.
Search in Google Scholar
8. Bleaney, B., & Abragam, A. (1986). Electron paramagnetic resonance of transition ions. New York: Dover Publications.
Search in Google Scholar
9. Ivanshin, V. A., Deisenhofer, J., Krug von Nidda, H. A., Loidl, A., Mukhin, A. A., Balbashov, A. M., & Eremin, M. V. (2000). ESR study in lightly doped La_1-xSr_xMnO₃. Phys. Rev. B, 61(9), 6213–6219. DOI: 10.1103/PhysRevB.61.6213.10.1103/PhysRevB.61.6213
Search in Google Scholar
10. Stefaniuk, I., Bester, M., & Kuzma, M. (2008). Ferromagnetic resonance in CdCrTe solid solution. J. Phys.-Conf. Ser., 104, 012010. DOI: 10.1088/1742-6596/104/1/012010.10.1088/1742-6596/104/1/012010
Search in Google Scholar
11. Sreenivasan, M. G., Bi, J. F., Teo, K. L., Liew, T. J. (2008). Systematic investigation of structural and magnetic properties in molecular beam epitaxial growth of metastable zinc-blende CrTe towards half-metallicity. J. Appl. Phys., 103, 043908.10.1063/1.2885108
Search in Google Scholar
12. Kuzma, M., Stefaniuk, I., & Bester, M. (2010). Theoretical models and EPR study of Cr based diluted magnetic semiconductors. J. Phys.-Conf. Ser., 213, 012035. DOI: 10.1088/1742-6596/213/1/012035.10.1088/1742-6596/213/1/012035
Search in Google Scholar
13. Akram, M., & Nazar, F. M. (1983). Magnetic properties of CrTe, Cr₂₃Te₂₄, Cr₇Te₈, Cr₅Te₆, and Cr₃Te₄ compounds. J. Mater. Sci., 18, 423. DOI: 10.1007/BF00560631.10.1007/BF00560631
Search in Google Scholar
14. Langreth, D. C., & Wilkins, J. W. (1972). Theory of spin resonance in dilute magnetic alloys. Phys. Rev. B, 6, 3189. http://dx.doi.org/10.1103/PhysRevB.6.3189.
Search in Google Scholar

Dyson line and modified Dyson line in the EPR measurements

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