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Lee, Minseong; Hwang, Jeonghun; Choi, Eun Sang; Ma, Jie; Cruz, Clarina Dela; Zhu, Mengze; Ke, Xianglin; Dun, Zhiling; Zhou, H. D.

doi:10.1103/physrevb.89.104420

Cited by 70 publications

(100 citation statements)

References 35 publications

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“…A possible option is a family of Cobased compounds [11,12,14,15,19], which can possess an effective XXZ anisotropy due to the strong spinorbit coupling. For example, the latest estimation of the anisotropy parameter J/J z in Ba 3 CoSb 2 O 9 (S = 1/2) ranges from J/J z ≈ 1.18 to 1.3 [18,29,42].…”

Section: Discussionmentioning

confidence: 99%

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Exact diagonalization and cluster mean-field study of triangular-lattice XXZ antiferromagnets near saturation

et al. 2017

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Quantum magnetic phases near the magnetic saturation of triangular-lattice antiferromagnets with XXZ anisotropy have been attracting renewed interest since it has been suggested that a nontrivial coplanar phase, called the π-coplanar or Ψ phase, could be stabilized by quantum effects in a certain range of anisotropy parameter J/Jz besides the well-known 0-coplanar (known also as V ) and umbrella phases. Recently, Sellmann et al. [Phys. Rev. B 91, 081104(R) (2015)] claimed that the π-coplanar phase is absent for S = 1/2 from an exact-diagonalization analysis in the sector of the Hilbert space with only three down-spins (three magnons). We first reconsider and improve this analysis by taking into account several low-lying eigenvalues and the associated eigenstates as a function of J/Jz and by sensibly increasing the system sizes (up to 1296 spins). A careful identification analysis shows that the lowest eigenstate is a chirally antisymmetric combination of finite-size umbrella states for J/Jz 2.218 while it corresponds to a coplanar phase for J/Jz 2.218. However, we demonstrate that the distinction between 0-coplanar and π-coplanar phases in the latter region is fundamentally impossible from the symmetry-preserving finite-size calculations with fixed magnon number. Therefore, we also perform a cluster mean-field plus scaling analysis for small spins S ≤ 3/2. The obtained results, together with the previous large-S analysis, indicate that the π-coplanar phase exists for any S except for the classical limit (S → ∞) and the existence range in J/Jz is largest in the most quantum case of S = 1/2.

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Section: Discussionmentioning

confidence: 99%

“…For instance, the layered TLAF materials such as Ba 3 CoSb 2 O 9 [11][12][13][16][17][18] and Ba 3 CoNb 2 O 9 [14,15] possess XXZ-type anisotropy in the spin-exchange interactions on each layer. The interactions between the spins on the single layer are modeled by the following XXZ Hamiltonian:…”

Section: Introductionmentioning

confidence: 99%

Exact diagonalization and cluster mean-field study of triangular-lattice XXZ antiferromagnets near saturation

et al. 2017

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“…Around 3 g of powder was loaded in an Al-cylinder can and mounted in a close-cycled refrigerator. We used a neutron wavelength of λ =1.5405Å with a collimation of 12 ′ -open-6 ′ . Both the XRD and NPD patterns were analyzed by the Rietveld refinement program FullProf 36 .…”

Section: Methodsmentioning

confidence: 99%

Magnetic properties of the triangular lattice magnets A4B′B2O12 ( A=Ba<

et al. 2017

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The geometrically frustrated two dimensional triangular lattice magnets A4B'B2O12 (A = Ba, Sr, La; B' = Co, Ni, Mn; B = W, Re) have been studied by x-ray diffraction, AC and DC susceptibilities, powder neutron diffraction, and specific heat measurements. The results reveal that (i) the samples containing Co 2+ (effective spin-1/2) and Ni 2+ (spin-1) ions with small spin numbers exhibit ferromagnetic (FM) ordering while the sample containing Mn 2+ (spin-5/2) ions with a large spin number exhibits antiferromagnetic (AFM) ordering. We ascribe these spin number manipulated ground states to the competition between the AFM B'-O-O-B' and FM B'-O-B-O-B' superexchange interactions; (ii) the chemical pressure introduced into the Co containing samples through the replacement of different size ions on the A site finely tunes the FM ordering temperature of the system. We attribute this effect to the modification of the FM interaction strength induced by the change of the O-B-O angle through chemical pressure.

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“…In Ba 3 NiNb 2 O 9 (S = 1) 14 and Ba 3 CoNb 2 O 9 (S = 1/2) 15 , the multiferroicity was observed not only in the noncollinear spin state but also in the uud and oblique phases. So far, considerable efforts have been made to understand the multiferroicity of various magnetic materials [16][17][18][19][20][21] .…”

Section: Introductionmentioning

confidence: 97%

Magnetic phase diagram and multiferroicity ofBa3MnNb2O9: A spin-52triangular lattice antif

et al. 2014

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We have performed magnetic, electric, thermal and neutron powder diffraction (NPD) experiments as well as density functional theory (DFT) calculations on Ba3MnNb2O9. All results suggest that Ba3MnNb2O9 is a spin-5/2 triangular lattice antiferromagnet (TLAF) with weak easy-axis anisotropy. At zero field, we observed a narrow two-step transition at TN1 = 3.4 K and TN2 = 3.0 K. The neutron diffraction measurement and the DFT calculation indicate a 120• spin structure in ab plane with out-of-plane canting at low temperatures. With increasing magnetic field, the 120• spin structure evolves into up-up-down (uud) and oblique phases showing successive magnetic phase transitions, which fits well to the theoretical prediction for the 2D Heisenberg TLAF with classical spins. Multiferroicity is observed when the spins are not collinear but suppressed in the uud and oblique phases.

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Series of phase transitions and multiferroicity in the quasi-two-dimensional spin-12triangular-lattice antiferromagnetBa3CoNb2O9

Cited by 70 publications

References 35 publications

Exact diagonalization and cluster mean-field study of triangular-lattice XXZ antiferromagnets near saturation

Exact diagonalization and cluster mean-field study of triangular-lattice XXZ antiferromagnets near saturation

Magnetic properties of the triangular lattice magnets A4B′B2O12 ( A=Ba<

Magnetic phase diagram and multiferroicity ofBa3MnNb2O9: A spin-52triangular lattice antif

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