Fermi-surface imaging effect in the D short-range order ofPdDx

A Fermi-surface imaging effect is proposed to explain the concentration-dependent D short-range order in the vicinity of the (1,½,0) point of $\mathrm{Pd}{\mathrm{D}}_x$ with $0.7<x<\mathrm{}0.78\mathrm{}$. Within a rigid-band approximation the shape of the Fermi surface in Pd${\mathrm{D}}_{0.75}$ is deduced from that calculated by Gupta and Freeman for stoichiometric PdH. In Pd${\mathrm{D}}_{0.75}$ the obtained Fermi surface shows flat portions and $2k_F$ vectors close to the (1,½,0) points.