Magnetic properties of the S=1/2 one-dimensional antiferromagnet MgVO3

The magnetic susceptibility and the electron spin resonance in the X-band o f the transition metal oxide compound MgVO3 are reported. We show that this compound, made of weakly coupled infinite chains of VO5 pyramids, behaves as a S = 1/2 one-dimensional Heisenberg antiferromagnet. From the ESR and m agnetic experiments we deduce the Neel temperature T-N = 5.2 +/- 0.5 K, the in-chain coupling constant J/k = 100 +/- 5 K and the g-factor values g(x) = g(z) = 1.972(2), g(y) = 1.946(1) for V4+ ions in MgVO3.