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Effect of nonmagnetic impurities on the residual electron-spin-resonance linewidth of Er:Ag dilute alloys.
E. D. Dahlberg, J. Souletie, S. A. Dodds, E. P. Chock, R. L. Orbach
Phys. Rev. B 41 p. 10897 (1990).
Abstract: The authors have undertaken a systematic investigation of the effect of nonmagnetic impurities on the residual (T to 0 K) electron-spin-resonance linewidth of erbium in dilute (200 parts per million atomic (ppm)) Er:Ag alloys. The nonmagnetic impurities used were In, Sn, Sb, Y, and Lu in the concentration range of 500-4600 ppm. The linewidth broadening caused by these impurities was found to be 0.2+or-0.11, 0.49+or-0.1, 0.51+or-0.11, 1.4+or-0.18, and 1.37+or-0.32 G/1000 ppm atomic frequency (GHz) for In, Sn, Sb, Y, and Lu, respectively. The most reasonable source of the Er line broadening is the mixing of the crystal-field levels of the Er by the Kohn-Vosko oscillations in the charge density. The broadening of the Er resonance line due to In, Sn, and Sb doping is consistent with the expected form of the oscillations. Also, Y and Lu are equivalent in the broadening of the Er line, as expected. However, the scaling of the Y and Lu broadening compared to that due to the In, Sn, and Sb is not consistent. The reasons for this are not understood. (17 References).
last modified:
10.Jun.2002
by Thomas Gredig