Accession Number : AD0716655

Title :   Magnetic-Field-Induced Semiconductor-Semimetal Transition in Bi-Sb Alloys,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PHYSICS

Personal Author(s) : Fenton,E. W. ; Jan,J.-P. ; Karlsson,A.

Report Date : 02 JUN 1970

Pagination or Media Count : 28

Abstract : Accurate and detailed measurements of the temperature dependence of the longitudinal magnetoresistance of single-crystal Bi-Sb alloys have been made, with static magnetic fields in the range 0-100 kG oriented parallel to the trigonal axis. Alloy concentrations were in the range 8-12 at.%Sb, and temperatures in the range 1-35 K. At very high fields the resistance increases with increasing temperature in a metallic manner with 'ideal' and 'residual' components, in contrast to the semiconductor behavior observed at zero field or low fields. For the high-field semimetal regime the electrical resistance behaves in a simple manner similar to a metal in zero field, in contrast to the complicated magnetoresistance phenomena for metals in low fields. This behavior can be understood in terms of a simple quasi-one-dimensional extreme-quantum-limit regime. The magnetic-field-induced semiconductor-semimetal transition is associated with an energy gap and changes of the energy-band structure which are of order 1 meV. (Author)

Descriptors :   (*SEMICONDUCTORS, *BAND THEORY OF SOLIDS), (*ANTIMONY ALLOYS, ELECTRICAL CONDUCTIVITY), (*BISMUTH ALLOYS, ELECTRICAL CONDUCTIVITY), METALLOIDS, SINGLE CRYSTALS, MAGNETIC FIELDS, ELECTRICAL RESISTANCE, BRILLOUIN ZONES, TRANSITION TEMPERATURE, CRYOGENICS, CANADA

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE