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VOLUME 55 (1992) | ISSUE 11 | PAGE 639
Unambiguous dependence of the period of the helicoidal magnetic structure in heavy magnetic rare-earth materials on the ratio c/a of the crystal lattice; possible association with an electron topological transition
The period of the helicoidal magnetic structure in the magnetic rare-earth elements Tb, Dy, Ho, and Er is determined unambiguously by the ratio с/a of the hexagonal crystal lattice of these metals. The particular shape of this dependence can be explained by assuming that an extreme diameter of the Fermi surface, which determines the helicoid period according to Dzyaloshinskii, undergoes a square-root singularity at (c/a)cr = 1.582 as the result of an electron topological transition.