Magnetic order and spin-waves in the quasi-1D S=1/2 antiferromagnet {bf BaCu₂Si₂O₇}

M. Kenzelmann , A. Zheludev , S. Raymond , E. Ressouche , T. Masuda , P. B\"oni , K. Kakurai , I. Tsukada

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K. Uchinokura R. Coldea

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classification ❄️ cond-mat.str-el

keywords magneticspinantiferromagnetbacuwavewerealonganisotropy

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Elastic and inelastic neutron scattering were used to study the ordered phase of the quasi-one-dimensional spin-1/2 antiferromagnet ${\rm BaCu_{2}Si_{2}O_{7}}$. 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.

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Magnetic order and spin-waves in the quasi-1D S=1/2 antiferromagnet {bf BaCu₂Si₂O₇}

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