Hydrostatic pressure dependence of the Fermi surface of rhenium

Abstract

The derivatives with respect to hydrostatic pressure of nine extremal cross-sectional areas of the Fermi surface of the hexagonal transition metal rhenium have been measured by the fluid helium de Haas van Alphen phase shift technique. The samples were carefully aligned in situ to have a crystal symmetry axis ([0001] or [Formula: see text]) parallel to the magnetic field direction, in order to minimize spurious effects which might be produced by tilting of the sample; precise values of the de Haas van Alphen frequencies have been measured for these symmetry directions. With the field along [0001], oscillations have been observed that correspond to a branch which appeared to vanish near this direction in previous de Haas van Alphen studies. Clear evidence has been observed of the degeneracy along the A–L line on the hexagonal face of the Brillouin zone.