Noncollinear magnetism and Spin Dynamics of a Novel Frustrated Kagome-Strip Structure: Na<sub>2</sub>Co<sub>3</sub>(AsO<sub>4</sub>)<sub>2</sub>(OH)<sub>2</sub>
ORAL
Abstract
Spin 1/2 two-dimensional kagome lattice antiferromagnetic materials are one of the most highly frustrated magnetic lattices. One-dimensional kagome strip chains exhibit the same basic structural motif as two-dimensional kagome lattices where similar types of magnetic frustration are anticipated. Thus, a detailed study of the magnetism of kagome strip lattice may enlighten our understanding of the frustrated kagome magnetic lattice. A hydrothermal synthesis of Na2Co3(AsO4)2(OH)2, its structure, magnetic properties characterization, magnetic structure determination, and inelastic neutron scattering will be discussed in this presentation. The crystal structure was characterized using single crystal X-ray diffraction which reveals that Na2Co3(AsO4)2(OH)2 crystallizes in monoclinic crystal system C2/m (No. 12). Na2Co3(AsO4)2(OH)2 features a two-dimensional kagome strip lattice made from Co2+ and unveils an antiferromagnetic transition at TN = 14 K. Magnetic ground state at zero field was characterized using neutron powder diffraction. Below the magnetic transition, Na2Co3(AsO4)2(OH)2 orders into an antiferromagnetic structure with k-vector, k = (0.5,0.5,0.5). In the magnetic structure both Co(1) and Co(2) moments exclusively lie on the bc-plane. While Co(1) moment exclusively directs along the c-axis, the Co(2) moment lies mostly along the b-axis. Our study reflects the complexity of Co2+-based kagome strip magnetic lattice compound Na2Co3(AsO4)2(OH)2 which provides a perfect platform to explore frustrated magnetism in kagome and kagome strip magnetic lattices.
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Presenters
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Duminda Liurukara
University of Missouri, Oak Ridge National Laboratory
Authors
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Duminda Liurukara
University of Missouri, Oak Ridge National Laboratory