Galvanomagnetic Tensors of Bismuth Single Crystals at Low Temperatures

概要

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A measurement of the galvanomagnetic tensors of bismuth at the liquid helium temperature and in the magnetic field up to 10 kilo Oersted is reported of three single crystals with different crystallographic orientations. All non-vanishing tensor components (except one) predicted by the crystal symmetry and Onsager's reciprocal relation are measured. The dependency of the symmetric tensor components on the direction of the magnetic field is studied somewhat in detail. The experimental results are analysed semi-phenomenologically on the basis of the Boltzmann equation. Our experimental results of the absolute values and the field dependencies for the symmetric and antisymmetric tensor components respectively are such as expected theoretically in chemically pure samples. The anisotropy of the tensor components of typical type is, however, fairly small compared with that expected from the known energy surface anisotropy. This shows the importance of the anisotropic scattering or a failure of usual approximate theory, but unfortunately we could not obtain quantitative conclusion because a part of each anisotropy should have been attributed to undesirable boundary effect and other effects.
東北大学の論文