Low-temperature magnetic ordering in the perovskites Pr1−xAxCoO3 (A=Ca, Sr)

Deac, I. G.; Tetean, R.; Balasz, I.; Burzo, E.

doi:10.1016/j.jmmm.2009.06.034

Cited by 12 publications

(4 citation statements)

References 19 publications

(25 reference statements)

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“…Perovskite rare-earth cobaltites (RE)CoO3 have attracted considerable research interest recently due to their intriguing magnetic properties [1][2][3]. Additionally, useful material properties such as temperature-induced metal-insulator transitions and thermoelectricity have been reported as well [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Perovskite rare-earth cobaltites (RE)CoO 3 have attracted considerable research interest recently due to their intriguing magnetic properties. − Additionally, useful material properties such as temperature-induced metal–insulator transitions and thermoelectricity have been reported as well. − In the work presented here, we study microwave (MW)-assisted synthesis of the RE cobaltites (RE)CoO 3 (RE = La–Dy) series in order to demonstrate the feasibility of the MW technique for this class of materials. Furthermore, we show that the magnetism in microwave (MW) synthesized (RE)CoO 3 displays different types of magnetic ordering, , which depends on the RE cation and involves variation of the Co 3+ spin state (electronic configuration: Ar 3d 6 ).…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…This reveals that these films are more appropriately described as ferrimagnetic and display a monotonic temperature dependence with a T C of ∼60 K. Pr 3+ ions in bulk PCO do not show any ordering down to 4 K. 25 In doped Pr 1−x Sr x CoO 3 , long-range ferromagnetism associated with the Co ions is observed for x > 0.2 26 and can be attributed to the double exchange interaction among IS Co moments in an intermediate valence, mediated by a mobile e g electron. Features in the magnetism have been associated with an abrupt change in the magnetic anisotropy and a dramatic structural change, [26][27][28] associated with strong Pr 4f -O 2p orbital hybridization below 120 K. 26,29 However, in contrast to the findings in our work, Pr ordering does not occur even in these doped bulk systems.…”

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confidence: 87%

Ferrimagnetism in PrCoO3epitaxial films

et al. 2013

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“…Ca 2+ , Sr 2+ , Ba 2+ ). 2,16 In our previous work, 17 spin state transition from LS to IS was discovered in PrCoO 3 as Ca 2+ substitutes for Pr 3+ . In comparison with Pr-site substitution, one may expect rich physics from the doping effect at a Co 3+ site, 18 since a more complicated disorder than Ln site substitution could be produced, and since doping at a Co 3+ site may also cause spin state transition of Co 3+ ions.…”

Section: Introductionmentioning

confidence: 95%

Impact of hole doping on spin transition in perovskite-type cobalt oxides

Che

2016

Dalton Trans.

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Series of perovskite PrCo1-xNixO3-δ (x = 0-0.4) were prepared and carefully investigated to understand the spin state transition driven by hole doping and further to reveal the effect of spin state transition on electronic conduction. It is shown that with increasing doping level, the transition temperature Ts for Co(3+) ions from low-spin (LS) to intermediate-spin (IS) reduces from 211.9 K for x = 0 to 190.5 K for x = 0.4. XPS and FT-IR spectra demonstrate that hole doping promoted this transition due to a larger Jahn-Teller distortion. Moreover, a thermal activation of spin disorder caused by thermal population of the spin states for Co ions has a great impact on the electrical transport of these perovskite samples. This work may shed light on the comprehension of spin transition in cobalt oxides through hole doping, which is promising for finding new strategies of enhancing electronic conduction, especially for energy and catalysis applications.

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Low-temperature magnetic ordering in the perovskites Pr1−xAxCoO3 (A=Ca, Sr)

Cited by 12 publications

References 19 publications

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

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

Ferrimagnetism in PrCoO3epitaxial films

Impact of hole doping on spin transition in perovskite-type cobalt oxides

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