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

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

2011-01-13

arxiv.org/abs/1101.2546v2

Phys. Rev. B, 83, 144412 (2011)

Physics

Condensed Matter

Materials Science

10 pages + supplementary information and cif files, 7 figures, 6 tables

Scientific paper

10.1103/PhysRevB.83.144412

We report on the crystal structure and magnetic behavior of the spin-1/2 compound AgVOAsO4. Magnetic susceptibility, high-field magnetization, and electron spin resonance measurements identify AgVOAsO4 as a gapped quantum magnet with a spin gap Delta ~ 13 K and a saturation field H_s ~ 48.5 T. Extensive band structure calculations establish the microscopic magnetic model of spin chains with alternating exchange couplings J ~ 40 K and J' ~ 26 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 AgVOAsO4 a promising candidate for an experimental investigation of Bose-Einstein condensation and other exotic ground states in high magnetic fields.

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