The temperature dependence of the nuclear magnetic resonance of vanadium

Measurements have been made of the line width, intensity and shift of the 51 V magnetic resonance from vanadium metal over the range 25-330 °K. The absence of any detectable anomalies in these properties shows that the transition at around 250 °K cannot be associated with the occurrence of antiferromagnetism unless the fluctuation frequency of the internal magnetic fields exceeds 2 × 10 12 c/s. From consideration of nuclear electric quadrupole interactions, it is estimated that any deviation from cubic crystal symmetry at or below the transition point is less than 2 parts in 10 3 . The Knight shift increases from 0.571% at 25 °K to 0.580% at 330 °K with an accuracy to ±0.001%. From a comparison of the temperature dependence of Knight shift and magnetic susceptibility, the hyperfine field at a vanadium nucleus due to one d-electron spin was estimated to be -112 ± 17 kilogauss.