Crystal structure and charge order below the metal-insulator transition in the vanadium bronze $\beta$-SrV$_6$O$_{15}$

Claire Sellier (1) , Florent Boucher (1) , Etienne Janod (1)

1 IMN - Institut des Matériaux Jean Rouxel

Single crystal X-ray diffraction measurements were performed on one-dimensional mixed valence vanadium bronze $\beta$-SrV$_6$O$_{15}$ in which a metal-insulator transition exists at 170 K. Above 170 K the P2$_1$/a structure with zigzag order of Sr in the tunnels of vanadium is confirmed. In the structure below 170 K, the P2$_1$/a space group is retained with a b-axis threefold increase and a charge order appears. A Bond Valence Sum analysis shows that the charge order may consist in clusters of V$^{4+}$ regularly spaced along 1D direction.

Domaines: Autre [cond-mat.other]

Claire Sellier, Florent Boucher, Etienne Janod. Crystal structure and charge order below the metal-insulator transition in the vanadium bronze $\beta$-SrV$_6$O$_{15}$. Solid State Sciences, 2003, 5, pp.591-599. ⟨hal-00116484⟩