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Trigonal Warping of the Valence Band Fermi Surfaces of Tellurium
Author(s) -
Köhler H.
Publication year - 1974
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.2220650219
Subject(s) - tellurium , trigonal crystal system , image warping , condensed matter physics , valence (chemistry) , magnetoresistance , chemistry , physics , magnetic field , crystallography , crystal structure , quantum mechanics , inorganic chemistry , artificial intelligence , computer science
Trigonal warping of the valence band Fermi surfaces of tellurium, which was observed earlier by Shubnikov‐de Haas measurements for B ⊥ c ( c trigonal axis), was investigated in detail from the oscillatory part of the magnetoresistance using arrangements for the magnetic induction B not normal to the trigonal axis of the crystals. Keeping the angle υ = ∡ ( B, c ) at 70° while rotating the samples around their c ‐axis, a higher degree of reliability was achieved, where only fields up to 10 Tesla (100 kG) magnetic induction were necessary, and the observation of the effect was possible at hole concentrations of less than 1 × 10 18 cm −3 . Besides, a decision between the main influence of inversion or mirror symmetry of the trigonal warping on Shubnikov‐de Haas effect could be made for the first time. Numerical calculations were performed to fit the results using current ε( k ) models of the valence band of tellurium.