Antiferromagnet superzone effects

Electrical resistivity measurements on single crystals in the [001] direction by Stalinski et al. (1973) showed that the spin disorder resistivity of RSns compounds was not proportional to the de Gennes factor. Since these materials are antiferromagnetic superzone boundary effects might render impossible the estimation of the spin disorder resistivity as described in subsection 2.1. On the other hand, since the shape of the dp/dT curve of NdSns around the N6el temperature was qualitatively similar to that expected by the theory of... 

Since the wavevector describing the magnetic periodicity of the antiferromagnetic phases of the elements Tb-Tm is parallel to the c-axis, it transpires that the superzone energy gaps effectively remove a considerable fraction of the Fermi surface area projected normal to the c-axis, which thus produces a sharp increase in the c-axis resistivity below Tn (see fig. 6.39). The only portions of the calculated (hole) Fermi surface which have significant velocity components parallel to the c-axis are found in the network of arms located near the hexagonal faces of the Brillouin zone (see ch. 3 section 2.3.1). 

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