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

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

2003-02-24

arxiv.org/abs/cond-mat/0302476v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages ; to be published in Solid State Science

Scientific paper

10.1016/S1293-2558(03)00045-1

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.

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