Research Papers in Physics and Astronomy

 

Date of this Version

June 1969

Comments

Published by American Physical Society. Phys. Rev. 182, 658 (1969). Copyright © 1969 American Physical Society. Permission to use.

Abstract

Measurements of the magnetoresistance and Hall voltage have been made in the high-field region on the metallic fluorite compounds AuAl2, AuGa2, and AuIn2. The results have been compared with those expected from the nearly-free-electron (NFE) model. These compounds are uncompensated. The magnetoresistance measurements in principal planes and directions, with one exception, support the NFE model, but the dimensions of the two-dimensional areas of aperiodic open orbits show pronounced deviations. Hall-effect measurements for B in the 〈100〉 and 〈111〉 directions indicate significant departures of the real Fermi surface from the NFE model. A proposed empirical model gives much better agreement with Hall-effect, magneto-resistance, and de Haas-van Alphen measurements. In the best AuGa2 crystal, magnetoresistance whiskers have been observed and classified in some detail. The magnetoresistance has been calculated for B in the {100} plane, assuming a constant relaxation time and a model of the fourth electron zone with a topography similar to the NFE Fermi surface.

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