Frustrated couplings between alternating spin-12 chains in AgVOAsO4

Alexander A. Tsirlin, Ramesh Nath, Jörg Sichelschmidt, Yurii Skourski, Christoph Geibel, and Helge Rosner
Phys. Rev. B 83, 144412 – Published 15 April 2011
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We report on the crystal structure and magnetic behavior of the spin-12 compound AgVOAsO4. Magnetic susceptibility, high-field magnetization, and electron spin resonance measurements identify AgVOAsO4 as a gapped quantum magnet with a spin gap Δ13 K and a saturation field μ0Hs48.5 T. Extensive band structure calculations establish the microscopic magnetic model of spin chains with alternating exchange couplings J40 K and J26 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 in high magnetic fields.

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  • Received 12 January 2011


©2011 American Physical Society

Authors & Affiliations

Alexander A. Tsirlin1,*, Ramesh Nath1,2, Jörg Sichelschmidt1, Yurii Skourski3, Christoph Geibel1, and Helge Rosner1,†

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
  • 2School of Physics, Indian Institute of Science Education and Research, Trivandrum-695016, Kerala, India
  • 3Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden Rossendorf, D-01314 Dresden, Germany

  • *

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Vol. 83, Iss. 14 — 1 April 2011

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