Magnetic and Transport Properties of Ba6Fe8S15 and BaFe2S3:  Magnetoresistance in a Spin-Glass-Like Fe(II) System

Gönen, Z. Serpil; Fournier, P.; Smolyaninova, Vera N.; Greene, R. L.; Araújo‐Moreira, F. M.; Eichhorn, Bryan W.

doi:10.1021/cm0000346

Cited by 35 publications

(47 citation statements)

References 26 publications

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“…Such CX-AFM order was also predicted to be the ground state of BaFe 2 S 3 , which was later also confirmed using neutron techniques [33]. Un-der ambient conditions, BaFe 2 S 3 has a semiconducting ground state with a very small gap about 0.06 − 0.07 eV [34,35]. The most striking recent experimental discovery is that high pressure can drive BaFe 2 S 3 to become superconducting when the hydrostatic pressure exceeds about 11 GPa [33] and its highest T c can reach 24 K at 13.5 GPa [36].…”

Section: Introductionmentioning

confidence: 55%

Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in the two-leg ladders AFe2X3 ( A=Ba,K

et al. 2017

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The recent discovery of superconductivity in BaFe2S3 [Takahashi et al., Nat. Mater. 14, 1008(2015] has stimulated considerable interest in 123-type iron chalcogenides. This material is the first reported iron-based two-leg ladder superconductor, as opposed to the prevailing two-dimensional layered structures of the iron superconductors family. Once the hydrostatic pressure exceeds 11 GPa, BaFe2S3 changes from a semiconductor to a superconductor below 24 K. Although previous calculations correctly explained its ground state magnetic state and electronic structure, the pressure induced phase transition was not successfully reproduced. In this work, our first principles calculations find that with increasing pressure the lattice constants as well as local magnetic moments are gradually suppressed, followed by a first-order magnetic transition at a critical pressure, with local magnetic moments dropping to zero suddenly. Our calculations suggests that the self-doping caused by electrons transferred from S to Fe may play a key role in this transition. The development of a nonmagnetic metallic phase at high pressure may pave the way to superconductivity. As extensions of this effort, two other 123-type iron chalcogenides, KFe2S3 and KFe2Se3, have also been investigated. KFe2S3 also displays a first-order transition with increasing pressure, but KFe2Se3 shows instead a second-order, or weakly first-order, transition. The required pressures for KFe2S3 and KFe2Se3 to quench the magnetism are higher than for BaFe2S3. Further experiments can confirm the predicted first-order nature of the transition in BaFe2S3 and KFe2S3, as well as the possible metallic/superconductivity state in other 123-type iron chalcogenides under high pressure.

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Section: Introductionmentioning

confidence: 55%

Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in the two-leg ladders AFe2X3 ( A=Ba,K

et al. 2017

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“…In this study, we investigated in detail the magnetic properties of a sulphur-analogue of the Fe-based ladder materials, BaFe 2 S 3 (space group: orthorhombic, Cmcm) 18,19 , and undertook experimental trials in which this compound was subjected to high pressures to obtain the metallic state. The electronic properties of this material depend on the manner in which the samples are synthesized, and thus we present data for sample 1 describing magnetic properties, and data for a range of samples 1 to 6 describing high-pressure effects.…”

Section: Purpose Of This Studymentioning

confidence: 99%

Pressure-induced superconductivity in the iron-based ladder material BaFe2S3

et al. 2015

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All the iron-based superconductors identified to date share a square lattice composed of Fe atoms as a common feature, despite having different crystal structures. In copper-based materials, the superconducting phase emerges not only in square lattice structures but also in ladder structures. Yet iron-based superconductors without a square lattice motif have not been found despite being actively sought out. Here, we report the discovery of pressure-induced superconductivity in the iron-based spin-ladder material BaFe 2 S 3 , a Mott insulator with striped-type magnetic ordering below ~120 K. On the application of pressure this compound exhibits a metal-insulator transition at about 11 GPa, followed by the appearance of superconductivity below T c = 14 K, right after the onset of the metallic phase. Our findings indicate that iron-based ladder compounds represent promising material platforms, in particular for studying the fundamentals of iron-based superconductivity.The discovery of iron-based superconductors had a significant impact on condensed matter physics and led to extensive study of the interplay between crystal structure, magnetism and superconductivity 1 . All the iron-based superconducting materials discovered to date share the same structural motif: a two-dimensional square lattice formed by edge-shared FeX 4 tetrahedra (X = Se, P and As). The Fe atoms are nominally divalent in most of the parent materials. These parent compounds undergo a magnetic transition at low temperatures, typically exhibiting striped-type ordering.Superconductivity appears when the magnetic order is fully suppressed by the application of pressure or by the addition of doping carriers through chemical Purpose of this studyThe application of pressure is often a useful means of changing the electronic structure of a compound so as to induce a metallic state without simultaneously introducing any degree of disorder 17 . In this study, we investigated in detail the magnetic properties of a sulphur-analogue of the Fe-based ladder materials, BaFe 2 S 3 (space group: orthorhombic, Cmcm) 18,19 , and undertook experimental trials in which this compound was subjected to high pressures to obtain the metallic state. The electronic properties of this material depend on the manner in which the samples are synthesized, and thus we present data for sample 1 describing magnetic properties, and data for a range of samples 1 to 6 describing high-pressure effects. The details of the sample preparation process are given in the Method section. Electronic properties under ambient pressureFigure 2a displays the temperature dependence of the electrical resistivity (ρ) of BaFe 2 S 3 along the leg direction under ambient pressure. The observed insulating behaviour, which occurs despite the expected metallic behaviour in an unfilled 3d manifold, is caused by the Coulomb repulsion between Fe 3d electrons, which becomes prominent in a quasi-one-dimensional ladder structure. Figure 2b shows the magnetic susceptibility (χ) at 5 T along the three orthorhombic...

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“…It should be noted that the shorter Fe-Fe bond in BaFe 2 S 3 may also have some contribution to higher conductivity. On the other hand, when compared to BaFe 2 S 3 which exhibits negative magnetoresistance (MR) below 25 K, 16 there is no obvious MR in BaFe 2 Se 3 as shown in Fig. 3.…”

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confidence: 99%

Anisotropy in BaFe2Se3single crystals with double chains of FeSe tetrahedra

et al. 2011

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We studied the anisotropy in physical properties of Ba 1.00(4) Fe 1.9(1) Se 3.1(1) single crystals. BaFe2Se3 is a semiconductor below 300 K. Magnetization measurements show that there is a crossover from a short-range antiferromangetic (AFM) correlations at room temperature to a longrange AFM order with TN = 255 K. The anisotropy of magnetization is consistent with the previous neutron results. This crossover is supported by the heat capacity measurement where the phasetransition peak is absent at 255 K. The superconducting transition at about 10 K is likely due to the small amount of β-FeSe impurities.

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Magnetic and Transport Properties of Ba₆Fe₈S₁₅ and BaFe₂S₃: Magnetoresistance in a Spin-Glass-Like Fe(II) System

Cited by 35 publications

References 26 publications

Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in the two-leg ladders AFe2X3 ( A=Ba,K

Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in the two-leg ladders AFe2X3 ( A=Ba,K

Pressure-induced superconductivity in the iron-based ladder material BaFe2S3

Anisotropy in BaFe2Se3single crystals with double chains of FeSe tetrahedra

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