Low-Temperature Structure of the Quarter-Filled Ladder Compound alpha'-NaV2O5

Details Low-Temperature Structure of the Quarter-Filled Ladder Compound alpha'-NaV2O5 Low-Temperature Structure of the Quarter-Filled Ladder Compound alpha'-NaV2O5

2001-09-10

arxiv.org/abs/cond-mat/0109164v1

J.Phys. Soc. Jpn. 71 (2002) 385-388

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, 1 table

Scientific paper

10.1143/JPSJ.71.385

The low-temperature (LT) superstructure of $\alpha'$-NaV$_2$O$_5$ was determined by synchrotron radiation x-ray diffraction. Below the phase transition temperature associated with atomic displacement and charge ordering at 34K, we observed the Bragg peak splittings, which evidence that the LT structure is monoclinic. It was determined that the LT structure is $(a-b)\times 2b \times 4c$ with the space group $A112$ where $a, b$ and $c$ represent the high temperature orthorhombic unit cell. The valence estimation of V ions according to the bond valence sum method shows that the V sites are clearly separated into two groups of V$^{4+}$ and V$^{5+}$ with a $zigzag$ charge ordering pattern. This LT structure is consistent with resonant x-ray and NMR measurements, and strikingly contrasts to the LT structure previously reported, which includes V$^{4.5+}$ sites.

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