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Antiferromagnetic ordering in Li₂MnO₃ single crystals with a two-dimensional honeycomb lattice
Sanghyun Lee1, Seongil Choi, Jiyeon Kim
1IBS Center for Functional Interfaces of Correlated Electron Systems, Seoul National University, Seoul 151-742, Korea.
Abstract:
Li(2)MnO(3) consists of a layered Mn honeycomb lattice separated by a single layer of LiO(6) octahedra along the c-axis. By using single crystal Li(2)MnO(3) samples, we have examined the physical properties and carried out both powder and single crystal neutron diffraction studies to determine that Mn moments order antiferromagnetically at T(N) = 36 K with an ordered magnetic moment of 2.3 μ(B) perpendicular to the ab plane. We have also discovered that about 35% of the full magnetic entropy is released in the supposedly simple paramagnetic phase, indicative of unusual spin dynamics at higher temperature.
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