Spin-State Transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>LaCoO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>: Direct Neutron Spectroscopic Evidence of Excited Magnetic States

Podlesnyak, A.; Streule, S.; Mesot, J.; Medarde, M.; Pomjakushina, E.; Conder, K.; Tanaka, A.; Haverkort, M. W.; Khomskii, Daniel I.

doi:10.1103/physrevlett.97.247208

Cited by 247 publications

(204 citation statements)

References 32 publications

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“…The Co 3+ spin states may be (a) low-spin (LS) (t2g 6 eg 0 ), (b) intermediate-spin (IS) (t2g 5 eg 1 ), or (c) high-spin (HS) (t2g 4 eg 2 ) [10][11][12]. The competition between different spin states has caused large controversy in the literature previously [10,[12][13][14][15][16][17][18][19], but in most studies only the case of LaCoO3 has been considered. Different studies favor either a LS to IS or a LS to HS state transition by heating across Ts1 ≈ 75 K [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

et al. 2016

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Citation for published item:quti¡ errez eij sD tuli nd r doEqonj lD tes¡ us nd ¡ evil fr ndeD h vid nd erryD s n nd wor¡ nD imilio nd hmidtD iner @PHIUA 9wi row veE ssisted synthesisD mi rostru tureD nd m gneti properties of r reEe rth o ltitesF9D snorg ni hemistryFD ST @IAF ppF TPUETQQF Further information on publisher's website:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in Inorganic Chemistry, copyright c 2016 American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see https://doi.org/10.1021/acs.inorgchem.6b02557. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe series of perovskite rare-earth (RE) doped cobaltites (RE)CoO3 (RE = La -Dy) was prepared by microwave-assisted synthesis. The crystal structure undergoes a change of symmetry depending on the size of the RE cation. LaCoO3 is rhombohedral, S.G. , while for the rest of the RE series (Pr -Dy) the symmetry is orthorhombic, S.G. Pnma (No. 62). The crystal structure obtained by X-Ray diffraction was confirmed by high resolution transmission electron microscopy, which yielded a good match between experimental and simulated images. It is further shown that the well-known magnetism in LaCoO3, which involves a thermally induced Co 3+ (d 6 ) low spin to intermediate or high spin state transition, is strongly modified by RE-doping and a rich variety of magnetic order has been detected across the series.

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Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

et al. 2016

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“…However, the spin structure at different temperatures has been highly debated. For example, the LS-HS [17,18], LS-IS [19,20], and LS-HS/LS crossover scenarios have been discussed in the literature [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Strain-driven spin-state transition and superexchange interaction in LaCoO3:Abinitiostudy

2012

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Using spin density functional theory with the Hubbard correction we investigate the magnetic structure of strained LaCoO 3 . We show that beyond biaxial tensile strain of 2.5%, local magnetic moments originating from the high spin (HS) state of Co 3+ emerge in a low spin (LS) Co 3+ matrix. In contrast, we find that compressive strain is not able to stabilize a magnetic state due to geometric constraints. LaCoO 3 accommodates tensile strain via spin state disproportionation resulting in an unusual sublattice structure. In tensile-strained LaCoO 3 , the first nearest neighbor (n.n.) exchange coupling is ferromagnetic (FM) while the second n.n. interaction is stronger and antiferromagnetic (AFM). This unusual feature of the exchange parameters is qualitatively verified with a model superexchange calculation. Due to the competition between the FM and AFM couplings in the system, we find that the most probable magnetic structure of tensile-strained LCO is a canted-spin structure, which may explain the relatively small observed magnetic moment of 0.7μ B /Co 3+ .

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“…Lanthanum Cobaltate (LaCoO 3 ) has been an intriguing subject of research primarily because of the spin state equilibria and the anomalous magnetic behaviour accompanying this crossover [1][2][3][4][5][6][7][8][9][10][11]. The oxygen octahedra coordinating the cobalt ion in the prototypical perovskite structure controls the delicate balance between the Hund's coupling and the crystal field splitting energy for the d electrons of Co 3?…”

Section: Introductionmentioning

confidence: 99%

Influence of Al doping in LaCoO3 on structural, electrical and magnetic properties

et al. 2014

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We report investigations on polycrystalline LaCo 1-x Al x O 3 (x = 0-0.9) bulk samples. The solid state synthesized samples showed a coexistence of rhombohedral and monoclinic phases in the intermediate concentrations (0.2 B x B 0.5) and pure rhombohedral phase otherwise. The observed effect of Al doping on dc transport has been analysed on the basis of small polaron hopping mechanism. The magnetisation results presented give evidence of weak ferromagnetism and anomalous temperature dependence of coercivity which we associate to the canting of the localised high-spin Co(III) and anti-symmetric exchange interactions at low temperatures.

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Spin-State Transition inLaCoO3: Direct Neutron Spectroscopic Evidence of Excited Magnetic States

Cited by 247 publications

References 32 publications

Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

Strain-driven spin-state transition and superexchange interaction in LaCoO3:Abinitiostudy

Influence of Al doping in LaCoO3 on structural, electrical and magnetic properties

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