The addition of Ti + and Mg'+ to V2O, leads to the suppression of the antiferromagnetic insulating phase; whereas the addition of Ti'+, Zr'+, and Fe'+ results in a first-order transition from a metallic to an insulating state. The effect of impurity ions is discussed in terms of the changes they cause in the bandwidth in analogy with the effect of pressure. The Hall coefficient of metallic V20, at 4.2 'K and 20 kbar is AH =+(3.5+0.4) X 10 cm'/C which is close to the value measured at 150 'K and 1 atm, The residual resistivity of metallic V20, is strongly impurity dependent (140 p, A cm/at. % Cr and 35 p, A cm/at. % Ti).These results are not completely consistent with current theories for the metal-insulator transition in V203 but the best available model still seems to involve a localized-to-nonlocalized transition within the d band primarily involving orbitals in the basal plane.
Be measuring the degree of linear polarization we identify the orbital and spin contributions to the xray magnetic scattering in holmium. When the incident x-ray energy is tuned through the L\\\ absorption edge, we observe a fiftyfold resonant enhancement of the magnetic signal, and resonant integer harmonics. The line shapes of the two linear components scattered parallel and perpendicular to the diffraction plane are distinct in energy with a 6-eV splitting.
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