Investigation by spherical neutron polarimetry of magnetic properties in BaCo2(AsO4)2

Investigation by spherical neutron polarimetry of magnetic properties in BaCo2(AsO4)2

The cobaltite BaCo2(AsO4)2 (BCAO) is a good realization of the quasi-2D system in which the Co2+ ions form a magnetically frustrated honeycomb lattice with magnetic moments mainly confined in the basal planes. Below , the ground state structure is described by an incommensurate propagation vector k{...

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Veröffentlicht in:Physica. B, Condensed matter Condensed matter, 2006-11, Vol.385-386, p.425-427
Hauptverfasser: Regnault, L.P., Boullier, C., Henry, J.Y.
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container_title Physica. B, Condensed matter
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creator Regnault, L.P.
Boullier, C.
Henry, J.Y.
description The cobaltite BaCo2(AsO4)2 (BCAO) is a good realization of the quasi-2D system in which the Co2+ ions form a magnetically frustrated honeycomb lattice with magnetic moments mainly confined in the basal planes. Below , the ground state structure is described by an incommensurate propagation vector k{approximately equal to}(0.265,0,-1.33) and the magnetic excitation spectrum displays a resolution-limited energy gap at q=0. No magnetic excitations emerging from q=k could be detected, contrary to what would be expected for a simple helimagnetic ground state. In order to understand these puzzling results, we have recently re-investigated the magnetic structure and excitations in BCAO using spherical neutron-polarization analysis.
doi_str_mv 10.1016/j.physb.2006.05.142
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title Investigation by spherical neutron polarimetry of magnetic properties in BaCo2(AsO4)2
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