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We report on the crystal structure and magnetic behavior of the spin-1/2compound AgVOAsO4. Magnetic susceptibility, high-field magnetization, andelectron spin resonance measurements identify AgVOAsO4 as a gapped quantummagnet with a spin gap Delta ~ 13 K and a saturation field H_s ~ 48.5 T.Extensive band structure calculations establish the microscopic magnetic modelof spin chains with alternating exchange couplings J ~ 40 K and J' ~ 26 K.However, the precise evaluation of the spin gap emphasizes the role ofinterchain couplings which are frustrated due to the peculiar crystal structureof the compound. The unusual spin model and the low energy scale of theexchange couplings make AgVOAsO4 a promising candidate for an experimentalinvestigation of Bose-Einstein condensation and other exotic ground states inhigh magnetic fields.

Frustrated couplings between alternating spin-1/2 chains in AgVOAsO4