Searching for magnetic defects in the two-dimensional honeycomb lattice compound BaCo2(AsO4)2
We propose to re-explore the magnetic structure of BaCo2(AsO4) in the context of Kitaev physics, following recent theoretical proposal to realise bond-dependent interaction in cobalt-based honeycomb lattice systems. BaCo2(AsO4), in particular, exhibits a peculiar magnetic structure at zero field, consisting of pseudo chains along the b-axis alternating and forming an incommensurate ++-- pattern along a*. Under a magnetic field applied along b, this structure becomes metastable and highly 2D. Correlations lengths are highly anisotropic within the honeycomb layers, despite its perfectly regular structure. The presence of magnetic domain walls was proposed to explain these features. We would like to look for signatures of magnetic defects using SANS in zero-field and under a magnetic field (0-0.5 T) at several temperatures. We request 3 days on D33 with a wavelength of 6A to perform this study.
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SONGVILAY Manila; CUBITT Robert; J.E. Lorenzo; MARTIN Nicolas; REGNAULT Louis Pierre and SIMONET Virginie. (2021). Searching for magnetic defects in the two-dimensional honeycomb lattice compound BaCo2(AsO4)2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-566
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