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Electrical Conductivity and NMR-Investigations in the A15-and σ-Phase of V-Co Compounds in the High Temperature Range

Abstract The electrical resistivity of the A15-and σ-phase of V-Co compounds has been measured in the temperature range 300 to 1300 K. Its temperature coefficient is found to be positive for the A15-phase, but negative for the σ-phase. For the same compounds we carried out 55V-and 59Co-Knight shift measurements in the high temperature range (300-1100 K). The 51V-NMR-line corresponding to the central transition (m = +½→m= -½) shows over the entire temperature range the characteristic splitting due to the second-order quadrupole interaction, whereas the 59Co-NMR-line does not show any splitting. Using these NMR measurements we determined for the A15-phase the isotropic and anisotropic parts of the 51V-Knight shift, the quadrupole coupling constant e2qQ/h and the "line width" ⊿B. The experimental results are discussed in the frame of models concerning hyperfine field and electric conductivity of transition metals and their alloys.