Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-03-13
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures
Scientific paper
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.
Günther Albert
Loidl Alois
Pregelj M.
Tsurkan Vladimir
Zaharko O.
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