Preprint / Condensed Matter JINRP14200183 P14200183


Relaxation of the Shallow Acceptor Center Magnetic Moment in a Highly Doped Silicon


Mamedov, T N ; Andrianov, D G ; Herlach, D ; Gorelkin, V N ; Gritsaj, K I ; Duginov, V N ; Kormann, O ; Major, J V ; Stoikov, A V ; Zimmermann, U

Pages: 14 p
Year: 2001

Abstract: Results on the temperature dependence of the residual polarization of negative muons in crystalline silicon with germanium, boron and phosphorus impurities are presented. The measurements were carried out in a magnetic field of 0.1 T transverse to the direction of the muon spin in the temperature range 4.2300 K. It is found that in a silicon sample with a high concentration of germanium impurity (9\cdot 10^{19} cm^{3}), as in the samples of n and ptype silicon with impurity concentrations up to \sim 10^{17} cm^{3}, the relaxation rate \nu of the magnetic moment of the {_\mu}Alacceptor depends on temperature as \nu\sim T^q, q\approx 3 at t=(530) K. For the samples of degenerate silicon the absolute values of the relaxation rate increase and its temperature dependence becomes weaker in the same temperature range. On the basis of the experimental data it is concluded that for a degenerate silicon at T\leq 30 K the relaxation of the acceptor center magnetic moment is determined by the spinexchange scattering of free charge carriers on the acceptor. The estimates for the effective crosssections of spinexchange scattering of holes and electrons on the Alacceptor in Si are obtained.

Web-Page: http://www1.jinr.ru/Preprints/2001/p14200183.pdf
Language: rus

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