Spin‐Ladder Iron Oxide: Sr3Fe2O5

Kageyama, Hiroshi; Watanabe, Takashi; Tsujimoto, Yoshihiro; Kitada, Atsushi; Sumida, Yuji; Kanamori, Kazuyoshi; Yoshimura, Kazuyoshi; Hayashi, Naoaki; Muranaka, Shigetoshi; Takano, Mikio; Ceretti, Monica; Paulus, Werner; Ritter, C.; André, G.

doi:10.1002/anie.200801146

Cited by 100 publications

(84 citation statements)

References 34 publications

(24 reference statements)

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“…21 Corner-sharing FeO4 square planes are also found in Sr3Fe2O5, in which they form two-leg ladder chains. 22 The d-states of a FeO4 square plane are split as in Fig. 6a, 23,24 so that the down-spin d-states have only the 3z 2 r 2  level filled, with the empty {xz, yz} set lying immediately above.…”

Section: 11mentioning

confidence: 99%

Prediction of Spin Orientations in Terms of HOMO–LUMO Interactions Using Spin–Orbit Coupling as Perturbation

et al. 2015

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ConspectusFor most chemists and physicists, electron spin is merely a means needed to satisfy the Pauli principle in electronic structure description. However, the absolute orientations of spins in coordinate space can be crucial in understanding the magnetic properties of materials with unpaired electrons. At a low temperature the spins of a magnetic solid may undergo a long-range magnetic ordering, which allows one to determine the directions and magnitudes of spin moments by neutron diffraction refinements. The preferred spin orientation of a magnetic ion can be predicted on the basis of density functional theory (DFT) calculations including electron correlation and spin-orbit coupling (SOC). However, most chemists and physicists are unaware of how the observed and/or calculated spin orientations are related to the local electronic structures of the magnetic ions. This is true even for most crystallographers who determine the directions and magnitudes of spin moments because, for them, they are merely the parameters needed for the diffraction refinements. The objective of this article is to provide a conceptual framework of thinking about and predicting the preferred spin orientation of a magnetic ion by examining the relationship between the spin orientation and the local electronic structure of the ion. In general, a magnetic ion M (i.e., an ion possessing unpaired spins) in a solid or a molecule is surrounded with main-group ligand atoms L to form an MLn polyhedron, where n is typically 2 -6, and the d-states

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Section: 11mentioning

confidence: 99%

Prediction of Spin Orientations in Terms of HOMO–LUMO Interactions Using Spin–Orbit Coupling as Perturbation

et al. 2015

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“…Furthermore, a homologous series of Sr n+1 Fe n 2+ O 2n+1 (n = 1 10 , n = 2 16 and n = ∞ 9 ) is obtained by CaH 2 from CuO 3.5 which has an unusual square-planar coordination around copper (Fig 1 b). This new phase is isostructural with Nd 4 Cu 2 O 7 17 , La 2 CuO 3.5 18 , La 1.5 Nd 0.5 CuO 3.5 18 and La 1.8 Pr 0.2 CuO 3.5 19 .…”

Section: Introductionmentioning

confidence: 99%

“…The use of hydrides of electropositive metals as potent reducing agents such as NaH, LiH and CaH 2 at low-temperature, which is a technique recently introduced by Hayward, Rosseinsky, Dixon, Tsujimoto, Tassel, Romero and co-workers [3][4][5][6][7][8][9][10][11][12][13][14][15][16] , has provided a way to avoid this structural choice. For example, using NaH, YBaCo 2 O 4.5 and LaBaCo 2 O 4.25 are synthesized from YBaCo 2 O 5 and LaBaCo 2 O 5 , respectively 11 .…”

Section: Introductionmentioning

confidence: 99%

Topochemical reduction of the oxygen-deficient Ruddlesden−Popper phase (n= 1) La1.85Ca0.15CuO4− and electrical properties of the La1.85Ca0.15CuO3.5

Midouni

Houchati

Othmen

et al. 2019

Arabian Journal of Chemistry

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“…Examples of valence control by changing oxygen stoichiometry are the syntheses of SrFeO

_{2}

and Sr

_{3}

_{2}

_{5}

(which have abnormal Fe valences) [1,2] by reduction with CaH

_{2}

, [3,4,5] the synthesis of YBa

_{2}

_{3}

_{7 - x}

[6], LaMnO

_{3}

[7], and La

_{1 - x}

_{x}

FeO

_{3 - x}

[8] at high temperatures under reducing atmospheres, and the synthesis of MnCo

_{2}

_{4}

by atomic layer deposition [9]. These techniques require the use of a metal hydride that is highly moisture-sensitive, a controlled atmosphere (hydrogen gas), or a special device, respectively.…”

Section: Introductionmentioning

confidence: 99%

Control of Magnetic Properties of NiMn2O4 by a Microwave Magnetic Field under Air

2016

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NiMn2O4 prepared by conventional heating was irradiated with a microwave H-field using a single-mode cavity under air and magnetic properties of the microwave-irradiated material were investigated. X-ray diffraction and transmission electron microscopy demonstrated that the phase and microstructure are not affected by H-field irradiation. Measurements of the magnetization as a function of temperature revealed that the antiferromagnetic sublattice disappeared and electron spin resonance showed the existence of Mn2+, suggesting that Mn3+ is partially reduced. Moreover, the magnetization of NiMn2O4 was controlled from 35.3 to 18.2 emu/g and the coercivity from 140 to 750 Oe by changing the sample temperature during microwave irradiation. The reduction reaction of NiMn2O4 is controlled by microwave H-field irradiation, resulting in control over the magnetic properties.

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Spin‐Ladder Iron Oxide: Sr₃Fe₂O₅

Cited by 100 publications

References 34 publications

Prediction of Spin Orientations in Terms of HOMO–LUMO Interactions Using Spin–Orbit Coupling as Perturbation

Prediction of Spin Orientations in Terms of HOMO–LUMO Interactions Using Spin–Orbit Coupling as Perturbation

Topochemical reduction of the oxygen-deficient Ruddlesden−Popper phase (n= 1) La1.85Ca0.15CuO4− and electrical properties of the La1.85Ca0.15CuO3.5

Control of Magnetic Properties of NiMn2O4 by a Microwave Magnetic Field under Air

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