De Haas-Van Alphen Effect(redirected from De Haas-van Alfven effect)
de Haas-van Alphen effect[də¦häs ‚van′äl·fən i‚fekt]
De Haas-Van Alphen Effect
an oscillating dependence of the magnetic susceptibility x of metals on the strength of the magnetic field H observed at temperatures near absolute zero. It was discovered by W. J. de Haas and P. M. van Alphen in 1930. In describing the de Haas-van Alphen effect, just as for the Shubnikov-de Haas effect, it is convenient to regard the dependence on 1/H rather than on H (Figure 1). The amplitude of the oscillations decreases with an increase in temperature. The oscillation period is related to the area of the extreme sections of the Fermi surface; consequently, the study of the de Haas-van Alphen effect makes it possible to obtain information about the shape of the surface.