Experimental proof for a quasi-one-dimensional band structure of V₃Si

A positron annihilation experiment on V₃Si in the [100] direction is presented. It shows that the Fermi surface (FS) contains planar sections, proving the q-1-D nature of the electronic band structure. One possible way to account for the positions of the planar sections, is by a band structure with a FS at ∼ 0.9 π a, belonging to the σ-band (m_l = 0) and a δ₂-band (m_l = ±2) with a density of states peak just below the Fermi level, which yields planar sections of the FS at ∼ 0.2 π a and ∼ 0.6 π a, in agreement with a LCAO calculation.