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Title: Effect of nanostructuring on the band structure and the galvanomagnetic properties in Bi{sub 1−x}Sb{sub x} alloys

Magnetotransport measurements were performed on a series of nanostructured Bi{sub 1−x}Sb{sub x} alloy samples with an Sb content in the range between 0% and 60%. The samples were prepared by cold pressing and annealing of crystalline Bi{sub 1−x}Sb{sub x} nanoparticles, which were synthesized by mechanical alloying. The incorporation of Sb changes the band structure of these nanotextured alloys as well as their transport behavior. With increasing Sb content the band gap increases and reaches a maximum band gap of 42 meV at an Sb concentration of about 14% determined from temperature dependent resistivity measurements. For even higher Sb content, the band gap decreases again. The bands and thus the band gaps are shifted with respect to bulk material due to quantum confinement effects in the nanostructures. The change of the band structure with varying Sb content strongly affects the magnetoresistance behavior as well as the magnetic field dependence of the Hall-coefficient. Using a three band model in order to describe both properties, it was possible to determine the main band parameters of the nanostructured material as a function of the Sb content.
Authors:
; ;  [1] ; ; ;  [2]
  1. Institute of Experimental Physics I, Justus-Liebig University, Heinrich-Buff-Ring 16, D-35392 Giessen (Germany)
  2. Institute of Inorganic and Analytical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen (Germany)
Publication Date:
OSTI Identifier:
22258744
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 19; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABUNDANCE; ALLOYS; ANNEALING; COLD PRESSING; CONCENTRATION RATIO; MAGNETIC FIELDS; MAGNETORESISTANCE; NANOSTRUCTURES; TEMPERATURE DEPENDENCE