The temperature dependence of the nuclear magnetic resonance of vanadium

Abstract

Measurements have been made of the line width, intensity and shift of the 51V 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 × 1012 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 103. 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.