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.
*Research conducted at ORNL's Spallation Neutron Source and High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U. S. Department of Energy. The work performed at Clemson University was supported by the NSF grant DMR – 2219129. Magnetic measurements taken at the University of Tennessee were supported by the DOE early career program, Award DE-SC0021344.
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Presenters
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Duminda Liurukara
- University of Missouri
- Oak Ridge National Laboratory