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Paper detail

Barlowite as a canted antiferromagnet: theory and experiment

We investigate the structural, electronic and magnetic properties of the newly synthesized mineral barlowite Cu4(OH)6FBr which contains Cu2+ ions in a perfect kagome arrangement. In contrast to the spin-liquid candidate herbertsmithite ZnCu3(OH)6Cl2, kagome layers in barlowite are perfectly aligned due to the different bonding environments adopted by F- and Br- compared to Cl-. We perform density functional theory calculations to obtain the Heisenberg Hamiltonian parameters of Cu4(OH)6FBr which has a Cu2+ site coupling the kagome layers. The 3D network of exchange couplings together with a substantial Dzyaloshinskii-Moriya coupling lead to canted antiferromagnetic ordering of this compound at TN=15 K as observed by magnetic susceptibility measurements on single crystals.

preprint2014arXivOpen access
Harald O. JeschkeFrancesc Salvat-PujolElena GatiNguyen Hieu HoangBernd WolfMichael LangJohn A. SchlueterRoser Valenti
cond-mat.str-el
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Harald O. JeschkeFrancesc Salvat-PujolElena GatiNguyen Hieu HoangBernd WolfMichael LangJohn A. SchlueterRoser Valenti

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