1996 Volume 65 Issue 8 Pages 2655-2663
The magnetic susceptibility (χ ) and the 51V Knight shift (K) measurements are performed on the perovskite LaVO3 in the paramagnetic state. By analyzing the K-χ diagram, independent contributions of spin and orbital susceptibilities to the observed one are determined experimentally. The spin susceptibility was found to be suppressed from the Curie-Weiss law for S=1 spins well above the Néel temperature. It was also found that the hyperfine coupling constant for d spin is largely reduced from the usual core-polarization contribution. The analysis based on a local-moment model shows that this reduction may be caused by a large transferred hyperfine coupling between the neighboring V3+ ions rather than by covalency with O2- ions. This accounts for all the NMR data rather quantitatively, though, the sign and the magnitude of the transferred hyperfine field are not compatible with any existing microscopic theories.
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