Strong ferromagnetic exchange interaction under ambient pressure in 
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Wang, Meng; Jin, Shu; Yi, Ming; Song, Yu; Jiang, Hanchen; Zhang, W. L.; Sun, Hengchao; Luo, Huiqian; Christianson, A. D.; Bourret-Courchesne, Edith; Lee, D. H.; Yao, Dao‐Xin; Birgeneau, R. J.

doi:10.1103/physrevb.95.060502

Cited by 24 publications

(16 citation statements)

References 45 publications

(39 reference statements)

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“…The pattern of single and double occupied sites in the itinerant electrons is meant to be random, representing pictorially the not-localized nature of those orbitals. tion, for BaFe 2 Se 3 [22], BaFe 2 S 3 [23], and RbFe 2 Se 3 [24] the INS revealed the existence of low-energy acoustic and high-energy optical modes separated by an energy gap. It is important to remark that the generic features of the INS spectra of the aforementioned compounds are similar, but the physical origin of the acoustic modes can differ significantly -these modes reflect on the long-distance properties of the magnetic order in the system.…”

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confidence: 99%

Spin dynamics of the block orbital-selective Mott phase

et al. 2018

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Iron-based superconductors display a variety of magnetic phases originating in the competition between electronic, orbital, and spin degrees of freedom. Previous theoretical investigations of the multi-orbital Hubbard model in one-dimension revealed the existence of an orbital-selective Mott phase (OSMP) with block spin order. Recent inelastic neutron scattering (INS) experiments on the BaFe2Se3 ladder compound confirmed the relevance of the block-OSMP. Moreover, the powder INS spectrum revealed an unexpected structure, containing both low-energy acoustic and high-energy optical modes. Here we present the theoretical prediction for the dynamical spin structure factor within a block-OSMP regime using the density-matrix renormalization-group method. In agreement with experiments, we find two dominant features: low-energy dispersive and high-energy dispersionless modes. We argue that the former represents the spin-wave-like dynamics of the block ferromagnetic islands, while the latter is attributed to a novel type of local on-site spin excitations controlled by the Hund coupling.

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confidence: 99%

Spin dynamics of the block orbital-selective Mott phase

et al. 2018

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“…In both systems, the FeX 4 edge-sharing tetrahedra create well-separated iron ladders [11], distinct from the planar square lattice of other FeSCs. These compounds therefore represent an important new family of materials that has attracted significant theoretical and experimental attention in the quest to understand iron-based superconductivity [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. BaFe 2 S 3 belongs to the orthorhombic space group Cmcm and orders antiferromagnetically below ∼100-120 K in a stripe-type spin configuration [8].…”

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confidence: 99%

“…BaFe 2 S 3 samples were grown by the Bridgman method, forming small, needle-like single crystals a few millimeters in length. The details of the synthesis procedure have been documented previously [26,30]. Due to the difficulty of co-aligning such crystals, we ground 8 g of single crystals into a powder for subsequent mea-arXiv:1807.10703v2 [cond-mat.supr-con] 5 Nov 2018…”

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Gradual enhancement of stripe-type antiferromagnetism in the spin-ladder material BaFe2S3 under pressure

Zheng

Frandsen

et al. 2018

Phys. Rev. B

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We report pressure-dependent neutron diffraction and muon spin relaxation/rotation measurements combined with first-principles calculations to investigate the structural, magnetic, and electronic properties of BaFe2S3 under pressure. The experimental results reveal a gradual enhancement of the stripe-type ordering temperature with increasing pressure up to 2.6 GPa and no observable change in the size of the ordered moment. The ab initio calculations suggest that the magnetism is highly sensitive to the Fe-S bond lengths and angles, clarifying discrepancies with previously published results. In contrast to our experimental observations, the calculations predict a monotonic reduction of the ordered moment with pressure. We suggest that the robustness of the stripe-type antiferromagnetism is due to strong electron correlations not fully considered in the calculations.

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“…Recent experimental investigations have shown that the two-leg ladder materials from the so-called 123 family, i.e., AFe 2 X 3 where A are alkali metals and X chalcogenides, become superconducting under pressure [12][13][14], as in the Cu-based equivalents. Canonical (𝜋, 0) order, i.e., staggered antiferromagnetic (AFM) ordering along the legs and ferromagnetic (FM) along the rungs, was identified in (Ba,K)Fe 2 S 3 [15] and (Cs,Rb)Fe 2 Se 3 [16][17][18]. More recent measurements on CsFe 2 Se 3 [19] suggest that an incommensurate order emerges in this compound instead of the AFM.…”

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confidence: 92%

Quantum magnetism of iron-based ladders: Blocks, spirals, and spin flux

2021

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Motivated by increasing experimental evidence of exotic magnetism in low-dimensional iron-based materials, we present a comprehensive theoretical analysis of magnetic states of the multiorbital Hubbard ladder in the orbital-selective Mott phase (OSMP). The model we used is relevant for iron-based ladders of the AFe 2 X 3 family (where A = Cs, Rb, Ba, K are alkali metals and X = S, Se are chalcogenides). To reduce computational effort, and obtain almost exact numerical results in the ladder geometry, we utilize a low-energy description of the Hubbard model in the OSMP-the generalized Kondo-Heisenberg Hamiltonian. Our main result is the doping vs interaction magnetic phase diagram. We reproduce the experimental findings on the AFe 2 X 3 materials, especially the exotic block magnetism of BaFe 2 Se 3 (antiferromagnetically coupled 2 × 2 ferromagnetic islands of the ↑↑↓↓ form). As in recent studies of the chain geometry, we also unveil block magnetism beyond the 2 × 2 pattern (with block sizes varying as a function of the electron doping) and also an interaction-induced frustrated block-spiral exotic state (a spiral order of rigidly rotating ferromagnetic islands). Moreover, we predict new phases beyond the one-dimensional system: a robust regime of phase separation close to half-filling, incommensurate antiferromagnetism for weak interaction, and a quantum spin-flux phase of staggered plaquette spin currents at intermediate doping. Finally, exploiting the bonding/antibonding band occupations, we provide an intuitive physical picture giving insight into the structure of the phase diagram.

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Strong ferromagnetic exchange interaction under ambient pressure in BaFe2S3

Cited by 24 publications

References 45 publications

Spin dynamics of the block orbital-selective Mott phase

Spin dynamics of the block orbital-selective Mott phase

Gradual enhancement of stripe-type antiferromagnetism in the spin-ladder material BaFe2S3 under pressure

Quantum magnetism of iron-based ladders: Blocks, spirals, and spin flux

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