Neutrons Scattering Study of Magnetic Correlations in Y$_{0.7}$La$_{0.3}$VO$_3$*

\textit{R}VO$_3$ ($R =$~rare earth) perovskite vanadites exhibit multiple orbital and spin orderings and provide a unique opportunity to study the spin-orbital-lattice coupling of $\pi$-bonding \textit{t} electrons. The nature of the orbital order in these vanadites has been a matter of significant controversy, particularly with respect to whether the different orbital-ordered phases of YVO$_3$ and LaVO$_3$ are best described by a novel orbital-Peierls model or more traditional Jahn-Teller interactions. Here we report on a neutron scattering study of the magnetic correlations in Y$_{0.7}$La$_{0.3}$VO$_3$, which may be expected to depend sensitively on the orbital degrees of freedom. The results are discussed in terms of the interplay between magnetism and orbital order.