FERMI SURFACE STUDIES IN SnTe.
NAVAL ORDNANCE LAB WHITE OAK MD
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The de Haas-van Alphen effect DHVA at temperatures from 1.6K to 7.9K was used to investigate the Fermi surface of SnTe. DHVA data in SnTe separated into two regions, a normal region above a carrier concentration of 3 x 10 to the 20th powercc and an anomalous region below. Above a carrier concentration of 3 x 10 to the 20th powercc, oscillations of a second band were observed, in addition to the first band oscillations. The second-band pockets are probably non-parabolic and have a shape greatly elongated in a 100 direction. A 111 cyclotron mass and Dingle temperature were measured in the first band and a 100 cyclotron mass and Dingle temperature in the second. In addition, a density of states was determined. Below a carrier concentration of 3 x 10 to the 20th powercc several branches were found describing the first-band pockets at L which are elongated in a 111 direction. Our observed minimum extremal cross section of the first band surface is more in agreement with the surface calculated by Rabii than with that calculated by Tung and Cohen. Author
- Solid State Physics