Zelek S. Herman, Robert F. Kirchner, et al.
Inorganic Chemistry
NMR frequency shift has been measured at V51 and P31 sites in a single crystal of the one-dimensional spin-1 antiferromagnet AgVP2S6. Parameters in the single-ion spin Hamiltonian were determined from the orbital (van Vleck) shift at V sites. Temperature dependence of the spin shift (spin susceptibility) is consistent with the theoretical prediction and the magnitude of the Haldane gap determined from neutron-scattering experiments. © 1995 The American Physical Society.