Frustrated magnetism in the layered triangular lattice materials K2Co(SeO3)2 and Rb2Co(SeO3)2

Zhong, Ruidan; Guo, Shu; Cava, R. J.

doi:10.1103/physrevmaterials.4.084406

Title: Frustrated magnetism in the layered triangular lattice materials K₂Co(SeO₃)₂ and Rb₂Co(SeO₃)₂

Journal Article · Wed Aug 12 00:00:00 EDT 2020 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.4.084406· OSTI ID:1803707

Zhong, Ruidan ^[1]; Guo, Shu ^[1]; Cava, R. J. ^[1]

Princeton Univ., NJ (United States)

A study of the layered triangular lattice materials K₂Co(SeO₃)₂ and Rb₂Co(SeO₃)₂ is reported here. These isostructural compounds crystallize in the trigonal space group R-3m (No. 166). The magnetic Co²⁺ 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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Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States); Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019331; GBMF-4412

OSTI ID:: 1803707

Journal Information:: Physical Review Materials, Vol. 4, Issue 8; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Frustrated magnetism in the layered triangular lattice materials K2Co(SeO3)2 and Rb2Co(SeO3)2

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Title: Frustrated magnetism in the layered triangular lattice materials K₂Co(SeO₃)₂ and Rb₂Co(SeO₃)₂