Temperature-dependent spin gap and singlet ground state in BaCuSi2O6

Preprint

5 September 1996

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9609055

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

SINGLET GROUND STATE
ANTIFERROMAGNET
RARE EARTH
BACUSI2O6
MAGNETIC
EXCITONS
SPIN GAP
NEUTRON

All Related Versions

Version 1, 1996-09-05, ArXiv
Published version: Physical Review B, 55 (13), 8357.

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