Spin-orbital phase diagram of perovskite-type RVO3 (R=rare-earth ion or Y) -: art. no. 100406

The global phase diagram for the spin and orbital ordering has been investigated for perovskite-type RVO3 (R being a rare-earth ion or Y) by measurements of specific heat, magnetization, and Raman-scattering spectra. RVO3 (R=Lu-Pr), in which the large tilting of VO6 tends to stabilize the collective Jahn-Teller distortion, shows a structural phase transition concomitantly with the G-type orbital ordering (OO) at a temperature far above the C-type magnetic transition temperature. By contrast the C-type spin correlation appears to develop primarily and then induce the G-type OO in CeVO3 and LaVO3 with smaller lattice distortion.