Charge Disproportionation and Magnetoresistivity in a Double Perovskite with Alternate Fe4+(d4) and Mn4+(d3) Layers

Subodh, G.; Tassel, Cédric; Hayashi, Naoaki; Goto, Yoshihiro; Bouilly, Guillaume; Yajima, Takeshi; Kobayashi, Yoji; Kageyama, Hiroshi

doi:10.1002/ejic.201402009

Cited by 10 publications

(6 citation statements)

References 37 publications

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“…A new compound containing the unusual high valence state Fe 4+ was recently obtained by low-temperature topochemical oxidation of the brownmillerite Ca 2 FeMnO 5 . , The compound is a fully oxygenated double perovskite Ca 2 FeMnO 6 with a layered arrangement of Fe 4+ O 6 and Mn 4+ O 6 octahedra (Figure ) and is the first compound that has an isolated two-dimensional layered arrangement of high valent Fe 4+ . The crystal structure at room temperature has a 2 a × √2 a × √2 a unit cell ( a represents a simple perovskite unit) with P 2 1 / c space group.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Charge Disproportionation of the Unusual High Valence State Fe⁴⁺ in a Layered Double Perovskite

et al. 2015

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The crystal and magnetic structures of charge-disproportionated Ca2FeMnO6 were analyzed by neutron powder diffraction. Ca2FeMnO6 is a layered double perovskite oxide with a two-dimensional arrangement of Mn(4+) and unusual high valence Fe(4+) at room temperature. When cooled, the compound shows charge disproportionation followed by magnetic transition. Around 200 K, the Fe(4+) shows the charge disproportionation to Fe(3+) and Fe(5+), which are ordered in a checkerboard pattern in the two-dimensional FeO6 octahedral layers. The magnetic transition occurs at 95 K, which is much lower than the charge disproportionation temperature. The magnetic structure is commensurate but noncollinear, and the antiferromagnetic coupling of Fe(3+) and Fe(5+) spins in the FeO6 octahedral layers gives the ferrimagnetic moments. The unique magnetic structure is described as a result of two-dimensional localization of the ligand holes with effective spins.

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Section: Introductionmentioning

confidence: 99%

Two-Dimensional Charge Disproportionation of the Unusual High Valence State Fe⁴⁺ in a Layered Double Perovskite

et al. 2015

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“…From the fit, the quadrupole splitting and the isomer shift values are estimated as ΔE Q = 0.37(4) mm s −1 and δ = 0.32(4) mm s −1 respectively. The observed value of quadruple shift point towards the existence of a significant charge asymmetry around Fe 3+ [34][35][36].…”

Section: Magnetization and Mössbauermentioning

confidence: 81%

Spin reorientation in antiferromagnetic Dy₂FeCoO₆ double perovskite

Haripriya

Heitmann

Yadav

et al. 2020

J. Phys.: Condens. Matter

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We explored the electronic and magnetic properties of the lanthanide double perovskite Dy2FeCoO6 by combining magnetization, Raman and Mössbauer spectroscopy and neutron diffraction along with density functional theory (DFT) calculations. Our magnetization measurements revealed two magnetic phase transitions in Dy2FeCoO6. First, a paramagnetic to antiferromagnetic transition at T N = 248 K and subsequently, a spin reorientation transition at T SR = 86 K. In addition, a field-induced magnetic phase transition with a critical field of H c ≈ 20 kOe is seen at 2 K. Neutron diffraction data suggested cation-disordered orthorhombic structure for Dy2FeCoO6 in Pnma space group which is supported by Raman scattering results. The magnetic structures ascertained through representational analysis indicate that at T N, a paramagnetic state is transformed to Γ5(Cx, Fy, Az) antiferromagnetic structure while, at T SR, Fe/Co moments undergo a spin reorientation to Γ3(Gx, Ay, Fz). The refined magnetic moment of (Fe/Co) is 1.47(4) μ B at 7 K. The antiferromagnetic structure found experimentally is supported through the DFT calculations which predict an insulating electronic state in Dy2FeCoO6.

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“…JT distortion-induced low-dimensional A 2 BB′O 6 double perovskites are of great interest, but they are rare. − Only a few compounds have been prepared to date, such as the layered Ln 2 CuMO 6 (Ln = La, Pr, Nd, Sm; M = Sn, Zr) − and the quasi-two-dimensional Sr 2 Cu(Mo 1– x W x )O 6 . La 2 CuSnO 6 can be prepared at ambient pressure, while the other Ln 2 CuMO 6 compounds can only be stabilized at 6–8 GPa.…”

Section: Introductionmentioning

confidence: 99%

Ba₃(Cr_0.97(1)Te_0.03(1))₂TeO₉: in Search of Jahn–Teller Distorted Cr(II) Oxide

Deng

Lapidus

et al. 2016

Inorg. Chem.

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A novel 6H-type hexagonal perovskite Ba(CrTe)TeO was prepared at high pressure (6 GPa) and temperature (1773 K). Both transmission electron microscopy and synchrotron powder X-ray diffraction data demonstrate that Ba(CrTe)TeO crystallizes in P6/mmc with face-shared (CrTe)O octahedral pairs interconnected with TeO octahedra via corner-sharing. Structure analysis shows a mixed Cr/Cr valence state with ∼10% Cr. The existence of Cr in Ba(CrCrTe)TeO is further evidenced by X-ray absorption near-edge spectroscopy. Magnetic properties measurements show a paramagnetic response down to 4 K and a small glassy-state curvature at low temperature. In this work, the octahedral CrO component is stabilized in an oxide material for the first time; the expected Jahn-Teller distortion of high-spin (d) Cr is not found, which is attributed to the small proportion of Cr (∼10%) and the face-sharing arrangement of CrO octahedral pairs, which structurally disfavor axial distortion.

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Charge Disproportionation and Magnetoresistivity in a Double Perovskite with Alternate Fe⁴⁺(d⁴) and Mn⁴⁺(d³) Layers

Cited by 10 publications

References 37 publications

Two-Dimensional Charge Disproportionation of the Unusual High Valence State Fe⁴⁺ in a Layered Double Perovskite

Two-Dimensional Charge Disproportionation of the Unusual High Valence State Fe⁴⁺ in a Layered Double Perovskite

Spin reorientation in antiferromagnetic Dy₂FeCoO₆ double perovskite

Ba₃(Cr_0.97(1)Te_0.03(1))₂TeO₉: in Search of Jahn–Teller Distorted Cr(II) Oxide

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Charge Disproportionation and Magnetoresistivity in a Double Perovskite with Alternate Fe4+(d4) and Mn4+(d3) Layers

Cited by 10 publications

References 37 publications

Two-Dimensional Charge Disproportionation of the Unusual High Valence State Fe4+ in a Layered Double Perovskite

Two-Dimensional Charge Disproportionation of the Unusual High Valence State Fe4+ in a Layered Double Perovskite

Spin reorientation in antiferromagnetic Dy2FeCoO6 double perovskite

Ba3(Cr0.97(1)Te0.03(1))2TeO9: in Search of Jahn–Teller Distorted Cr(II) Oxide

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Charge Disproportionation and Magnetoresistivity in a Double Perovskite with Alternate Fe⁴⁺(d⁴) and Mn⁴⁺(d³) Layers

Two-Dimensional Charge Disproportionation of the Unusual High Valence State Fe⁴⁺ in a Layered Double Perovskite

Two-Dimensional Charge Disproportionation of the Unusual High Valence State Fe⁴⁺ in a Layered Double Perovskite

Spin reorientation in antiferromagnetic Dy₂FeCoO₆ double perovskite

Ba₃(Cr_0.97(1)Te_0.03(1))₂TeO₉: in Search of Jahn–Teller Distorted Cr(II) Oxide