ANTIFERROMAGNETIC NUCLEAR RESPONSE OF V-51 IN LAVO3 AND YVO3

We have investigated the antiferromagnetic nuclear magnetic resonance (AFNR) of V-51 in perovskites LaVO3 and YVO3 under zero external magnetic field. In LaVO3, two distinct resonance lines are observed around 261.90+/-0.05 MHz and 268.98+/-0.05 MHz at 4.2 K. These signals are associated with the inequivalent V-51 sites generated by the structural transition at T(N). The Larmor frequencies at the inequivalent sites are found to show different temperature dependences. This clearly indicates that the temperature dependence of the sublattice magnetization is different for each site, and may be related to the anomalous diamagnetism of this compound. The resonance line is observed around 278.8+/-0.1 MHz at 4.2 K in YVO3. The hyperfine coupling constants of both substances are also estimated.