Impact of High Pressure and High Temperature on Annealed Oxygen-deficient CoSrO3−δ Perovskites: Structural and Magnetization Studies

Balamurugan, S.

doi:10.1007/s10948-009-0519-0

Cited by 8 publications

(1 citation statement)

References 47 publications

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“…The cubic structure is only stable for a narrow range of δ, since SrCoO 3−δ forms a homologous series (SrCoO (3n−1)/n ) for δ from 0.5 to 0 and changes its structure from orthorhombic via cubic and tetragonal to cubic again. [17][18][19] Even for this cubic range close to δ = 0, the lattice constant increases slightly with decreasing oxygen content, 15,16,18,20,21 whereas the critical temperature decreases from 292 K to 182 K. 15,21 Anyway, these values for polycrystalline samples are smaller than for a single crystal (T C = 305 K and δ = 0.05). 1 As for the T C values, the measurements of the magnetic moments vary for different experiments between 1.2 µ B to 2.6 µ B .…”

Section: Introductionmentioning

confidence: 91%

Magnetic properties of defect-free and oxygen-deficient cubicSrCoO3−δ

Hoffmann¹,

Borisov²,

Ostanin³

et al. 2015

Phys. Rev. B

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We investigated theoretically electronic and magnetic properties of the perovskite material SrCoO 3−δ with δ ≤ 0.15 using a projector-augmented plane-wave method and a Green's function method. This material is known from various experiments to be ferromagnetic with a Curie temperature of 260 K to 305 K and a magnetic moment of 1.5 µB to 3.0 µB. Applying the magnetic force theorem as it is formulated within the Green's function method, we calculated for SrCoO 3−δ the magnetic exchange interactions and estimated the Curie temperature. Including correlation effects by an effective U parameter within the GGA+U approach and verifying this by hybrid functional calculations, we obtained the Curie temperatures in dependence of the oxygen-deficiency close to the experimental values.

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Section: Introductionmentioning

confidence: 91%

Magnetic properties of defect-free and oxygen-deficient cubicSrCoO3−δ

Hoffmann¹,

Borisov²,

Ostanin³

et al. 2015

Phys. Rev. B

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Magnetic and Magneto-Transport Measurements of 57Fe-doped SrCoO3 and Sr1−x Cd x CoO3 Perovskites

Balamurugan

2010

J Supercond Nov Magn

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Syntheses and Magnetic-Properties of Zn-Diluted Sr-Based Perovskite Cobalt Oxides, Sr1−x Zn x CoO3; 0.05≤x≤0.3

Balamurugan

2012

J Supercond Nov Magn

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In order to check the solubility of Zn in the (Sr 1−x Zn x )CoO 3 perovskite structure and their research findings, several polycrystalline samples have been prepared under wide extreme synthesis conditions at 6 GPa/1300-1650°C. While 0.05 ≤ x ≤ 0.3 compositions revealed single phased cubic structure materials, x > 0.3 showed multiphased materials for (Sr 1−x Zn x )CoO 3 system. Like other substituted perovskite cobalt oxide systems (Ca, Y, Ho and Ce), the transport properties of the present materials show rather sizable changes with respect to 'x', although there are insignificant variations in lattice parameter and in Curie temperature, T c . All the present samples show soft ferromagnetism with T c in the range of 272-285 K for 0.05 ≤ x ≤ 0.3. The effective paramagnetic moment, P eff determined from the paramagnetic region decreases upon the substitution of Zn for Sr-site. These P eff (3.3-2.8 µ B /Co) values for 0.05 ≤ x ≤ 0.3 compositions seem to suggest that the Co 4+ lie in intermediate spin (IS) state for the present (Sr 1−x Zn x )CoO 3 series, although they are slightly smaller than those expected for IS-Co 4+ ; P eff = 3.87 µ B /Co. The electrical resistivity is found to increase with increase of 'x' for the investigated samples. The temperature and field dependence of both positive and negative magnetoresistance (MR) are noted for the Zn substituted samples. About 5% of -MR is observed for x = 0.05 sample around the transition temperature (280 K) under the field strength difference, H = 90 kOe. The present research findings are compared with our previous results on different perovskite cobalt oxides.

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Impact of High Pressure and High Temperature on Annealed Oxygen-deficient CoSrO3−δ Perovskites: Structural and Magnetization Studies

Cited by 8 publications

References 47 publications

Magnetic properties of defect-free and oxygen-deficient cubicSrCoO3−δ

Magnetic properties of defect-free and oxygen-deficient cubicSrCoO3−δ

Magnetic and Magneto-Transport Measurements of 57Fe-doped SrCoO3 and Sr1−x Cd x CoO3 Perovskites

Syntheses and Magnetic-Properties of Zn-Diluted Sr-Based Perovskite Cobalt Oxides, Sr1−x Zn x CoO3; 0.05≤x≤0.3

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