Trimerization in Vanadates with a Quasi-Triangular Lattice

Abstract

By synchrotron X-ray diffraction measurement, we found that V trimerization occurs in various vanadates with V ions on quasi-triangular lattice, AV₁₀O₁₅(bilayer), A₂V₁₃O₂₂(trilayer), and AV₁₃O₁₈(infinite layer), where A = Ba, Sr. We also found that this V trimerization substantially affects the electrical resistivity and magnetic susceptibility of these compounds. These results can be explained by the bond-ordered-type orbital ordering of V t_2g states.