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Antiferromagnetic ordering in Li2MnO3 single crystals with a two-dimensional honeycomb lattice

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Title: Antiferromagnetic ordering in Li2MnO3 single crystals with a two-dimensional honeycomb lattice

Author(s): Sanghyun Lee; Seongil Choi; Jiyeon Kim; Hasung Sim; Choongjae Won; Seongsu Lee; Shin Ae Kim; Namjung Hur; Je-Geun Park

Subject: Antiferromagnetic orderings, ; Honeycomb lattices, ; Magnetic entropy, ; Mn moment, ; Ordered magnetic moments, ; Paramagnetic phase, ; Single layer, ; Single-crystal neutron diffraction, ; Antiferromagnetism, ; Honeycomb structures, ; Magnetic moments, ; Manganese, ; Manganese oxide, ; Paramagnetism, ; Two dimensional, ; Single crystals

Abstract: Li 2MnO 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 2MnO 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=36K with an ordered magnetic moment of 2.3μ 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. © 2012 IOP Publishing Ltd.