Positron study of the Fermi surface of aNb50Mo50disordered alloy

The Fermi surface of a ${\mathrm{Nb}}_{50}$${\mathrm{Mo}}_{50}$ disordered alloy has been studied by two-dimensional angular correlation of positron-annihilation radiation. The measured Fermi surface is well defined and several dimensions of the ellipsoidal hole pocket at $N$ have been determined. The results are compared with the predictions of various alloy band calculations.