Magnetic order and spin-waves in the quasi-1D S=1/2 antiferromagnet $\mathbf{BaC}{\mathbf{u}}_2\mathbf{S}{\mathbf{i}}_2{\mathbf{O}}_7$

Abstract

Elastic and inelastic neutron scattering were used to study the ordered phase of the quasi-one-dimensional spin-1/2 antiferromagnet $\mathrm{BaC}{\mathrm{u}}_2\mathrm{S}{\mathrm{i}}_2{\mathrm{O}}_7$. The previously proposed model for the low-temperature magnetic structure was confirmed. Spin wave dispersion along several reciprocal-space directions was measured and inter-chain, as well as in-chain exchange constants were determined. A small gap in the spin wave spectrum was observed and attributed to magnetic anisotropy effects. The results are discussed in comparison with existing theories for weakly-coupled quantum spin chain antiferromagnets.

RevTex, 7 pages, 8 figures

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