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• W2066090976 abstract "The problem of electron paramagnetic resonance (EPR) in powders of highly conducting semiconductors and semimetals is examined. Attention is focused on the fact that the observed EPR signal can be strongly influenced by the conductivity of the powder grains, and particularly by the high degree of anisotropy (gyrotropy) of the conductivity which arises in these materials when a dc magnetic field is present. The interaction of a single powder grain with an electromagnetic wave is analyzed in terms of the recently developed theory of Ford and Werner for electromagnetic excitations of a gyrotropic sphere. Although the general form of this theory can only be handled numerically, we show that in the case of powder grains, which are typically small compared to the outside wavelength, closed analytic expressions can be obtained for the magnetic and electric polarizabilities of the particles. Using these polarizabilities as a point of departure, the description of the powder as a whole is then obtained in the form of an effective powder as a whole is then obtained in the form of an effective powder permeability and permittivity. A detailed analysis of these general results in specific parameter ranges shows that both the EPR line shape and its intensity depend strongly on the value of the particle conductivity, on its tensorial character, and on the particle size. It is demonstrated that when the powder particles are small compared to the skin-depth and internal wavelength, the EPR absorption line shape is Lorentzian, predicted by the imaginary (dissipative) part of the magnetic susceptibility χ. When particles are large compared to the skin depth, the EPR absorption line shape is determined by a mixture of the dispersive and dissipative components of χ, depending on the behavior of the elements of the magnetoconductivity tensor. Specific limiting cases of the electrical parameters are discussed and the effect of particle-size distribution on EPR in powders is also considered. Where available, experimental data are used to illustrate the behavior predicted by the analysis." @default.
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• W2066090976 date "1979-08-01" @default.
• W2066090976 modified "2023-09-26" @default.
• W2066090976 title "Electron paramagnetic resonance in powdered semiconductors and semimetals" @default.
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• W2066090976 doi "https://doi.org/10.1063/1.326593" @default.
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