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Determination of the Cyclotron Masses of the Conduction Band of Bi 1−x Sb x near the Semimetal‐Semiconductor Transition
Author(s) -
Fellmuth B.,
Krüger H.,
Rudolph R.,
Herrmann R.
Publication year - 1980
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221010231
Subject(s) - semimetal , antimony , condensed matter physics , anisotropy , effective mass (spring–mass system) , cyclotron , conductivity , wave vector , analytical chemistry (journal) , physics , chemistry , materials science , band gap , magnetic field , optics , inorganic chemistry , chromatography , quantum mechanics
In a number of n‐doped Bi 1−x Sb x samples approaching the semimetal‐semiconduct or transition (0.070 ≦ x ≦ 0.083), the propagation of magnetoplasma waves is investigated in the B ⊥ C 2 , ∥ k orientation at 4.2 K. The plane‐parallel samples are prepared from a single crystal exhibiting a slight gradient in the antimony concentration. By means of an ellipsoidal model of the conductivity tensor, the low cyclotron mass m c 2 and the anisotropy m c 3 / m c 2 are determined from the experimental dependence of the wave vector on the frequency and the magnetic field. In the samples with x < 0.073, the dispersion and the attenuation of the waves show peculiarities which can be explained by the presence of holes at the point T. The results obtained indicate a continuous dependence of the band characteristics on the antimony concentration in the neighbourhood of the point x 0 , where the overlapping of the bands at L and T is removed.