Block Magnetic Excitations in the Orbitally Selective Mott Insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BaFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Mourigal, Martin; Wu, Shu Qi; Stone, M. B.; Neilson, James R.; Caron, Jan; McQueen, Tyrel M.; Broholm, C.

doi:10.1103/physrevlett.115.047401

Cited by 71 publications

(85 citation statements)

References 39 publications

(84 reference statements)

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confidence: 60%

“…The magnetic structure consists of blocks of 4 FM spins forming alternating AF pattern along the leg direction [12]. The magnetic excitations in BaFe 2 Se 3 fits the description of localized spins and an orbital-selective Mott phase [13].The pressure-induced metal-insulator transition in BaFe 2 S 3 is categorized as a bandwidth-control type Mott transition [6,7]. The AF order is suppressed before SC arises at higher pressures [7].…”

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Magnetic Precursor of the Pressure-Induced Superconductivity in Fe-Ladder Compounds

et al. 2016

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The pressure effects on the antiferromagentic orders in iron-based ladder compounds CsFe2Se3 and BaFe2S3 have been studied using neutron diffraction. With identical crystal structure and similar magnetic structures, the two compounds exhibit highly contrasting magnetic behaviors under moderate external pressures. In CsFe2Se3 the ladders are brought much closer to each other by pressure, but the stripe-type magnetic order shows no observable change. In contrast, the stripe order in BaFe2S3, undergoes a quantum phase transition where an abrupt increase of Néel temperature by more than 50% occurs at about 1 GPa, accompanied by a jump in the ordered moment. With its spin structure unchanged, BaFe2S3 enters an enhanced magnetic phase that bears the characteristics of an orbital selective Mott phase, which is the true neighbor of superconductivity emerging at higher pressures.PACS numbers: 74.25. Ha, The antiferromagnetic (AF) phase adjacent to superconductivity (SC) is so richly faceted that its microscopic origin still eludes a unified description. Significant variation of the ordered magnetic moment and the underlying degree of electron correlations lie at the heart of the heated dispute [1][2][3]. The static AF phase in the parent compounds has roughly two categories: stripe magnetism and block magnetism. The former includes the single stripe in LaFeAsO, BaFe 2 As 2 , NaFeAs, and double stripe in FeTe [4]. Spin block order was found in the vacancy-ordered K 2 Fe 4 Se 5 (245) [5]. These materials all have a plane of Fe square lattice once deemed indispensable for the occurence of SC. The recent successful induction of SC by pressure in the ladder compound BaFe 2 S 3 [6,7] has introduced a quasi-one dimensional structural motif for the studies of iron-based superconductors and a parallel to the quasi-1D cuprates [8]. As if the layers of the superconducting Fe square lattice were sliced up and staggered, the AFe 2 X 3 (A = K, Rb, Cs or Ba and X = Chalcogens) compounds consist of ladders of two-leg Fechains with edge-sharing tetrahedra of anions (Se or S) surrounding each Fe site, as shown in Figure 1(a). The reduced dimensionality leads to modified bandwidth [9], Fermi surface topology, and provides a rare insight into critical open issues such as the nature of the AF order.Both stripe-and block-types of AF orders are hosted by the Fe-ladder compounds. BaFe 2 S 3 and CsFe 2 Se 3 , with the CsCu 2 Cl 3 type structure (Cmcm space group), have the stripe AF order where the ferromagnetic (FM) spin pairs on the same ladder rung correlate antiferromagnetically along the leg direction. The ordered moment lies in the rung-direction in BaFe 2 S 3 (Fig.1(b)) [6] and the leg-direction in CsFe 2 Se 3 (Fig.1(c)) [10]. In BaFe 2 Se 3 , the distorted FeSe 4 tetrahedron lose the Ccentering and result in the lowered symmetry P nma [11]. The magnetic structure consists of blocks of 4 FM spins forming alternating AF pattern along the leg direction [12]. The magnetic excitations in BaFe 2 Se 3 fits the description of localized spins and...

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Magnetic Precursor of the Pressure-Induced Superconductivity in Fe-Ladder Compounds

et al. 2016

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“…For this reason, iron-ladder compounds were the focus of many recent experimental and theoretical studies [1][2][3][12][13][14][15][16][17][18][19][20][21]. In particular, inelastic neutron scattering data [19] is compatible with the exciting idea that BaFe 2 Se 3 is in an orbital-selective Mott phase (OSMP) at ambient pressure [22][23][24], where one orbital is localized with a Mott gap while the others are gapless and itinerant (see Fig. 1a).…”

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confidence: 82%

“…It is conceivable that the block phase of localized spins of the Mott orbital c is driven by the Fermi nesting of itinerant orbitals, as in manganites and heavy-fermion systems [25]. In fact, re-cent experimental [19] and theoretical [26] work have confirmed that the magnetic excitations in BaFe 2 Se 3 cannot be fully described using an effective Heisenberg model, highlighting the role of the other degrees of freedom in this material that we are focusing on here.…”

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Fingerprints of an orbital-selective Mott phase in the block magnetic state of BaFe2Se3 ladders

et al. 2019

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Resonant Inelastic X-Ray Scattering (RIXS) experiments on the iron-based ladder BaFe2Se3 unveiled an unexpected two-peak structure associated with local orbital (dd) excitations in a block-type antiferromagnetic phase. A mixed character between correlated band-like and localized excitations was also reported. Here, we use the density matrix renormalization group method to calculate the momentum-resolved charge-and orbital-dynamical response functions of a multi-orbital Hubbard chain. Remarkably, our results qualitatively resemble the BaFe2Se3 RIXS data, while also capturing the presence of long-range magnetic order as found in neutron scattering, only when the model is in an exotic orbital-selective Mott phase (OSMP). In the calculations, the experimentally observed zero-momentum transfer RIXS peaks correspond to excitations between itinerant and Mott insulating orbitals. We provide experimentally testable predictions for the momentum-resolved charge and orbital dynamical structures, which can provide further insight into the OSMP regime of BaFe2Se3. arXiv:1807.10419v2 [cond-mat.str-el]

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“…Due to its enhanced degree of electronic correlation [27,29], the physical properties of BaFe 2 Se 3 become more complex. For example, the existence of an "orbital-selective Mott phase" (OSMP) was found by neutron experiments at ambient pressure [30]. This OSMP of BaFe 2 Se 3 was theoretically discussed based on DMRG methods by using multiorbital Hubbard models as well [31][32][33].…”

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confidence: 99%

Iron telluride ladder compounds: Predicting the structural and magnetic properties of BaFe2Te3

et al. 2020

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Since the discovery of pressure-induced superconductivity in the two-leg ladder system BaFe2X3 (X=S, Se), with the 3d iron electronic density n = 6, the quasi-one-dimensional iron-based ladders have attracted considerable attention. Here, we use Density Functional Theory (DFT) to predict that the novel n = 6 iron ladder BaFe2Te3 could be stable with a similar crystal structure as BaFe2Se3. Our results also indicate that BaFe2Te3 will display the complex 2×2 Block-type magnetic order. Due to the magnetic striction effects of this Block order, BaFe2Te3 should be a magnetic noncollinear ferrielectric system with a net polarization 0.31 µC/cm 2 . Compared with the S-or Se-based iron ladders, the electrons of the Te-based ladders are more localized, implying that the degree of electronic correlation is enhanced for the Te case which may induce additional interesting properties. The physical and structural similarity with BaFe2Se3 also suggests that BaFe2Te3 could become superconducting under high pressure.arXiv:1912.07749v1 [cond-mat.str-el]

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Block Magnetic Excitations in the Orbitally Selective Mott InsulatorBaFe2Se3

Cited by 71 publications

References 39 publications

Magnetic Precursor of the Pressure-Induced Superconductivity in Fe-Ladder Compounds

Magnetic Precursor of the Pressure-Induced Superconductivity in Fe-Ladder Compounds

Fingerprints of an orbital-selective Mott phase in the block magnetic state of BaFe2Se3 ladders

Iron telluride ladder compounds: Predicting the structural and magnetic properties of BaFe2Te3

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