DOI: 10.1063/10.0030519 ISSN: 0360-0335

A study of thermogalvanomagnetic wave dispersion in bismuth

V. N. Kopylov

The paper is devoted to an experimental study of low-frequency electromagnetic waves (propagating through a conducting medium in a temperature gradient and a direct current) in bismuth at helium temperatures. It has been shown experimentally that the dispersion relation of these waves is nearly linear (ω ∼k) and for small currents through the specimen the wave phase velocity is a linear function of the current and the temperature gradient, which accords with the theory developed in the present paper. As the current increases the current dependence of the phase velocity deviates appreciably from linearity and even becomes nonmonotonic. Analysis shows that such behavior, in our opinion, may be due to the influence of the intrinsic magnetic field of the current on the character of the wave propagation.

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