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Abstract:
Through a solid-state reaction, a practically phase pure powder of
Ba3V2S4O3 was obtained. The crystal structure was confirmed by X-ray
single-crystal and synchrotron X-ray powder diffraction (P6(3),
a=10.1620(2), c=5.93212(1)angstrom). X-ray absorption spectroscopy, in
conjunction with multiplet calculations, clearly describes the vanadium
in charge-disproportionated (VS6)-S-III and (VSO3)-S-V coordinations.
The compound is shown to be a strongly correlated Mott insulator, which
contradicts previous predictions. Magnetic and specific heat
measurements suggest dominant antiferromagnetic spin interactions
concomitant with a weak residual ferromagnetic component, and that
intrinsic geometric frustration prevents long-range order from evolving.
