Magnetic and transport properties of cobalt-doped perovskites SrTi1−xCoxO3 (x⩽0.5)

Pascanut, C.; Dragoe, Nita; Berthet, P.

doi:10.1016/j.jmmm.2005.11.020

Cited by 27 publications

(28 citation statements)

References 16 publications

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“…The lattice parameters of the samples were a = 3.8931(6)Å for the Co3B1500 sample,[42] a = 3.8994(2)Å for the Co2A1500 sample, and a = 3.8977(5)Å for the Co2A1600 sample. A decrease in the lattice parameter in doped samples as compared to that of undoped SrTiO 3 (a = 3.905Å) agrees with earlier published data [22,28] and indicates the formation of a solid solution.…”

Section: Resultssupporting

confidence: 90%

Electronic and magnetic properties of structural defects in SrTiO3(Co)

Sluchinskaya

Лебедев

2020

Journal of Alloys and Compounds

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The synthesis conditions of SrTiO3(Co) samples in which cobalt predominantly enters the A or B sites of the perovskite ABO3 structure are found. EXAFS studies show that the Co impurity at the A site is off-center and is displaced from the site by 1.0Å. XANES studies reveal two predominant oxidation states of Co: Co 2+ at the A site and Co 3+ at the B site. First-principles calculations of a number of possible cobalt-containing structural defects reveal defects whose properties are compatible with the experimentally observed Co oxidation state, its local structure, magnetic, electrical, and optical properties.

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Section: Resultssupporting

confidence: 90%

Electronic and magnetic properties of structural defects in SrTiO3(Co)

Sluchinskaya

Лебедев

2020

Journal of Alloys and Compounds

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“…We prepared SrTi 1Àx Co x O 3Àd solid solutions (x ¼ 0, 0.01, 0.02 et 0.05) in a bulk form by solid-state reaction in air, as described in our previous work [13]. Then, partially reduced samples, containing mainly Co 2+ ions as the ferromagnetic thin films reported till now in the literature, were also prepared.…”

Section: Methodsmentioning

confidence: 99%

“…However, the case of homogeneously doped perovskites was not investigated before our work, reported in a previous paper [13] dealing with the magnetic properties of SrTi 1Àx Co x O 3Àd (0.05rxr0.50) bulk samples prepared in air which do not exhibit ferromagnetism. However, if we compare this first series of results on bulk perovskites to report ferromagnetic thin films prepared by other authors, it is worth noting that two properties appear quite different: the concentration and the valence of magnetic ions are clearly higher in the bulks than in the films.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of low-doped bulk Sr(Ti, Co)O3−δ perovskites

Decorse

Berthon

Pinsard-Gaudart

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…In more recent works, however, magnetic ions at higher doping levels have been considered in non-magnetic perovskite oxides such as SrTiO 3 [1,[18][19][20][21][22][23][24][25][26][27]. Oxygen stoichiometry has been found to play an important role in determining the magnetic properties of these systems [18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Role of oxygen vacancies in room-temperature ferromagnetism in cobalt-substitutedSrTiO3

et al. 2014

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Ferromagnetic insulating behaviour has recently been demonstrated in cobalt-substituted SrTiO 3 at room temperature [1]. Experimentally, it was found that a well-defined hysteresis loop only occurs at high Co concentrations of 30-40%. X-ray photoelectron spectroscopy also indicated that Co substitutes for Ti with Co being in high-spin +2 oxidation state. In this work, we employ density-functional theory to explain the experimentally observed properties of cobalt-substituted SrTiO 3 . We examine in detail the role of oxygen vacancy (OV) defects and their formation of defect complexes with the Co ions as the origin of the ferromagnetic insulating behaviour. Our first-principles thermodynamic calculations indicate that OV defects are much more likely to occur next to Co atoms where their formation energies could be reduced by as much as 1.28 eV compared to that in bulk SrTiO 3 . We also find that Co in these Co-OV complexes occurs in the high-spin state in agreement with core level spectroscopy, and identify a linear arrangement of the Co-OV defect complexes to be the most energetically favourable structure. These defect complexes are also shown to interact ferromagnetically and that their magnetic interaction is found to be short-ranged, consistent with the relatively high Co concentrations needed experimentally for ferromagnetism to be observed in cobalt-substituted SrTiO 3 . I.Introduction The discovery of room-temperature ferromagnetism in doped transition metal oxides by Matsumoto et al. [2] has initiated many theoretical and experimental studies, owing to potential applications of these materials in spintronics. For example, , SnO 2 [5-6], In 2 O 3 [7][8] and TiO 2 [9][10], have all been reported to show room-temperature ferromagnetism when doped with magnetic ions. Increasing the Curie temperature and being able to control the spin degrees of freedom remain major challenges in this field. In this respect, defects in these materials, both intrinsic and extrinsic, play an important role. Defects provide additional carriers to the system (electrons or holes) which could significantly alter magnetic interactions and the Curie temperature in these materials.

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Magnetic and transport properties of cobalt-doped perovskites SrTi1−xCoxO3 (x⩽0.5)

Cited by 27 publications

References 16 publications

Electronic and magnetic properties of structural defects in SrTiO3(Co)

Electronic and magnetic properties of structural defects in SrTiO3(Co)

Magnetic properties of low-doped bulk Sr(Ti, Co)O3−δ perovskites

Role of oxygen vacancies in room-temperature ferromagnetism in cobalt-substitutedSrTiO3

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