Frustration enhanced by Kitaev exchange in a ̃ 𝑗 eff= 1/2 triangular antiferromagnet
Author(s): Wellm, C; Roscher, W; Zeisner, J; Alfonsov, A; Zhong, R; et al
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Abstract: | Triangular Heisenberg antiferromagnets are prototypes of geometric frustration, even if for nearest-neighbor interactions quantum fluctuations are not usually strong enough to destroy magnetic ordering: stronger frustration is required to stabilize a spin-liquid phase. On the basis of static magnetization and electron spin resonance measurements, we demonstrate the emergence of 𝑗 eff=1/2 moments in the triangular-lattice magnet Na2BaCo(PO4)2. These moments are subject to an extra source of frustration that causes magnetic correlations to set in far above both the magnetic ordering and Weiss temperatures. Corroborating thẽ𝑗 eff=1/2 ground state, theory identifies ferromagnetic Kitaev exchange anisotropy as an additional frustrating agent, altogether putting forward Na2BaCo(PO4)2 as a promising Kitaev spin-liquid material. |
Publication Date: | 30-Sep-2021 |
Electronic Publication Date: | 30-Sep-2021 |
Citation: | Wellm, C, Roscher, W, Zeisner, J, Alfonsov, A, Zhong, R, Cava, RJ, Savoyant, A, Hayn, R, van den Brink, J, Büchner, B, Janson, O, Kataev, V. Frustration enhanced by Kitaev exchange in a ˜jeff = 1/2 triangular antiferromagnet. Physical Review B, 104 (10), 10.1103/physrevb.104.l100420 |
DOI: | doi:10.1103/physrevb.104.l100420 |
ISSN: | 2469-9950 |
EISSN: | 2469-9969 |
Language: | en |
Type of Material: | Journal Article |
Journal/Proceeding Title: | Physical Review B |
Version: | Author's manuscript |
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