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We introduce a microscopic model which unravels the physical mechanismsresponsible for the observed phase diagram of the $R$VO$_3$ perovskites. Itreveals a nontrivial interplay between superexchange, the orbital-latticecoupling due to the GdFeO$_3$-like rotations of the VO$_6$ octahedra, andorthorhombic lattice distortions. We find that the lattice strain affects theonset of the magnetic and orbital order by partial suppression of orbitalfluctuations. The present approach provides also a natural explanation of theobserved reduction of magnon energies from LaVO$_3$ to YVO$_3$.

Evolution of Spin-Orbital-Lattice Coupling in the $R$VO$_3$ Perovskites