Frustrated magnetism in the layered triangular lattice materials K<sub>2</sub>Co(SeO<sub>3</sub>)<sub>2</sub> and Rb<sub>2</sub>Co(SeO<sub>3</sub>)<sub>2</sub> [electronic resource]
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| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2020.
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| Abstract: | A study of the layered triangular lattice materials K<sub>2</sub>Co(SeO<sub>3</sub>)<sub>2</sub> and Rb<sub>2</sub>Co(SeO<sub>3</sub>)<sub>2</sub> is reported here. These isostructural compounds crystallize in the trigonal space group R-3m (No. 166). The magnetic Co<sup>2+</sup> ions form a spin-1/2 triangular lattice and display strongly frustrated magnetism. We find no evidence in the susceptibility or heat capacity for in-plane ordering of the spins; rather the in-plane inverse susceptibility is typical of that seen for frustrated magnets. At around 10 K, a ferromagnetic component appears in the magnetic susceptibility perpendicular to the triangular planes. The heat capacity at low applied fields does not show sharp features, but in larger applied fields a sharp ferromagneticlike transition appears. Field- and direction-dependent magnetization measurements at 2 K indicate that both materials have a magnetic easy axis perpendicular to the triangular planes. The magnetic properties are sensitive to the field applied perpendicular to the triangular planes, which induces a metamagnetization transition at 0.75 T. Spin polarization develops along with the increasing out-of-plane field, resulting in a saturated ferromagnetic state at high fields. In contrast, the magnetic properties are resistant to the in-plane field. Our results suggest that these materials are embodiments of Ising spins on triangular lattices with easy-axis anisotropy. |
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| Item Description: | Published through Scitech Connect. 08/12/2020. "Journal ID: ISSN 2475-9953." ": US2212162." Zhong, Ruidan ; Guo, Shu ; Cava, R. J. ; Johns Hopkins Univ., Baltimore, MD (United States) |
| Physical Description: | Size: Article No. 084406 : digital, PDF file. |