M. Pregelj, O. Zaharko, A. Günther, A. Loidl, V. Tsurkan
Anisotropic magnetic properties of a layered Kagom\'e-like system Cu3Bi(SeO3)2O2Br have been studied by bulk magnetization and magnetic susceptibility measurements as well as powder and single crystal neutron diffraction. At T_N = 27.4K the system develops an alternating antiferromagnetic order of (ab) layers, which individually exhibit canted ferrimagnetic moment arrangement, resulting from the competing ferro- and antiferro-magnetic intralayer exchange interactions. A magnetic field B_C ~ 0.8 T applied along the easy c-axis (perpendicular to the layers) triggers a metamagnetic transition, when every second layer flips, i.e., resulting in a ferrimagnetic structure. Significantly higher fields are required to rotate the ferromagnetic component towards the b-axis (~ 7 T) or towards the c-axis (~ 15 T). Finally, the estimates of the exchange coupling constants and features indicative of the XY character of this quasi 2D system are presented.
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http://arxiv.org/abs/1203.2782
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