Peculiarities in the electron spectrum of superconducting Laves phase Zrsub(x)Hfsub(1-x)V2

Structurally unstable superconducting Laves phases Zrsub(x)Hfsub(1-x)V2 were investigated in the temperature range 4.2-300K for temperature dependence on magnetic susceptibilities chi, resistivity rho, and X-ray fluorescent emission 2K-spectra of vanadium. Anomalous dependences chi and rho as compared to common metals was discovered below 150K. This may be explained in terms of a phase transition of Peierl's type when the lattice instability results from the instability of the electron spectrum due to the dielectric slit that appears on flat parts of the Fermi surface. The presence of regions with localised electron density in the Laves phases on the low-energy side of the vanadium emission spectrum at low temperatures (T = 10 K) indicates an essential rebuilding in the electron spectrum of valence electrons. (author)