Temperature-dependent spin gap and singlet ground state in BaCuSi2O6

Y. Sasago; K. Uchinokura; A. Zheludev; G. Shirane

doi:10.1103/PhysRevB.55.8357

Temperature-dependent spin gap and singlet ground state in BaCuSi2O6

Condensed Matter 2009-10-28 v1

Authors: Y. Sasago , K. Uchinokura , A. Zheludev , G. Shirane

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Abstract

Bulk magnetic measurements and inelastic neutron scattering were used to investigate the spin-singlet ground state and magnetic gap excitations in BaCuSi2O6, a quasi-2-dimensional antiferromagnet with a bilayer structure. The results are well described by a model based on weakly interacting antiferromagnetic dimers. A strongly temperature-dependent dispersion in the gap modes was found. We suggest that the observed excitations are analogous to magneto-excitons in light rare-earth compounds, but are an intrinsic property of a simple Heisenberg Hamiltonian for the S=1/2 magnetic bilayer.

Keywords

spin excitations in condensed matter magnetic materials and spin systems frustrated magnetism

Cite

@article{arxiv.cond-mat/9609055,
  title  = {Temperature-dependent spin gap and singlet ground state in BaCuSi2O6},
  author = {Y. Sasago and K. Uchinokura and A. Zheludev and G. Shirane},
  journal= {arXiv preprint arXiv:cond-mat/9609055},
  year   = {2009}
}

Comments

10 pages, 4 figures, REVTeX and PS for text, PS for figures direct download: http://papillon.phy.bnl.gov/preprints/bacusio.html

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