We report on the crystal structure and magnetic behavior of the spin- compound AgVOAsO. Magnetic susceptibility, high-field magnetization, and electron spin resonance measurements identify AgVOAsO as a gapped quantum magnet with a spin gap K and a saturation field T. Extensive band structure calculations establish the microscopic magnetic model of spin chains with alternating exchange couplings K and K. However, the precise evaluation of the spin gap emphasizes the role of interchain couplings which are frustrated due to the peculiar crystal structure of the compound. The unusual spin model and the low energy scale of the exchange couplings make AgVOAsO a promising candidate for an experimental investigation of Bose-Einstein condensation in high magnetic fields.
- Received 12 January 2011
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