Effect of cation size variance on spin and orbital order in   Eu$_{1-x}$(La$_{0.254}$Y$_{0.746}$)$_{x}$VO$_3$
  We have investigated the $R$-ion ($R$ = rare earth or Y) size variance effect on spin/orbital order in Eu$_{1-x}$(La$_{0.254}$Y$_{0.746}$)$_{x}$VO$_3$. The size variance disturbs one-dimensional orbital correlation in $C$-type spin/$G$-type orbital ordered states and suppresses this spin/orbital order. In contrast, it stabilizes the other spin/orbital order. The results of neutron and resonant X-ray scattering denote that in the other ordered phase, the spin/orbital patterns are $G$-type/$C$-type, respectively. 
R. Fukuta, S. Miyasaka, K. Hemmi, S. Tajima, D. Kawana, K. Ikeuchi, Y.   Yamasaki, A. Nakao, H. Nakao, Y. Murakami, and K. Iwasa
cond-mat.str-el