Pressure effect on magnetic susceptibility of LaCoO3

Панфилов, А. С.; Grechnev, G. E.; Zhuravleva, I.; Lyogenkaya, A. A.; Pashchenko, V. A.; Савенко, Б. Н.; Novoselov, Dmitry Y.; Prabhakaran, D.; Troyanchuk, I. O.

doi:10.1063/1.5030456

Cited by 11 publications

(10 citation statements)

References 45 publications

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“…At ≈100 K the material becomes paramagnetic, and with increasing temperature, a higher Co spin configuration is populated. There has been much interest as to whether the intermediate‐spin

t_{2 g}^{5} e_{g}^{1}

(

S = 1

) or the high‐spin

t_{2 g}^{4} e_{g}^{2}

(

S = 2

) state of the Co 3+ is populated at this temperature . Above 648 K charge transfer between Co cations is observed and disproportionation into Co 2+ and Co 4+ species occurs .…”

Section: Introductionmentioning

confidence: 99%

High‐Pressure Neutron Diffraction Study of LaCoO₃

Capone

Ridley

Funnell

et al. 2019

Physica Status Solidi (a)

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The authors report a high-pressure variable-temperature neutron diffraction study of LaCoO 3 , from ambient to 6 GPa at 120, 290, and 480 K. The authors see no evidence for previously-reported discontinuities in the Co─O and La─O distances in the pressure and temperature ranges studied. Such discontinuities have previously been attributed to the well-documented spin-state transition of the Co 3þ cation (from t 5 2g e 1 g , S ¼ 1 !t 6 2g e 0 g , S ¼ 0), the authors conclude that manifestations of the electronic configuration of LaCoO 3 are not evident in the crystallographic structure upon pressurization. The authors also report bulk moduli for each of these temperatures as 134 (2), 135(1), and 111(1) GPa, respectively, as fitted to a second-order Birch-Murnaghan equation of state.

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“…At ≈100 K the material becomes paramagnetic, and with increasing temperature, a higher Co spin configuration is populated. There has been much interest as to whether the intermediate‐spin

t_{2 g}^{5} e_{g}^{1}

(

S = 1

) or the high‐spin

t_{2 g}^{4} e_{g}^{2}

(

S = 2

) state of the Co 3+ is populated at this temperature . Above 648 K charge transfer between Co cations is observed and disproportionation into Co 2+ and Co 4+ species occurs .…”

Section: Introductionmentioning

confidence: 99%

High‐Pressure Neutron Diffraction Study of LaCoO₃

Capone

Ridley

Funnell

et al. 2019

Physica Status Solidi (a)

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“…The present LaCo 6 O 11 sample contains LaCoO 3 and LaCo 12 O 19 impurities, thus we first considered the possible influence of these impurities on magnetic data. LaCoO 3 behaves as a paramagnetic or nonmagnetic phase below room temperature (300 K) with a magnetic susceptibility of 5×10 –3 emu/mol 23,24 . Since the amount of LaCoO 3 is small (9 wt%), no significant contribution to the magnetic susceptibility is expected.…”

Section: Resultsmentioning

confidence: 99%

“…LaCoO 3 behaves as a paramagnetic or nonmagnetic phase below room temperature (300 K) with a magnetic susceptibility of 5×10 -3 emu/mol. 23,24 Since the amount of LaCoO 3 is small (9 wt%), no significant contribution to the magnetic susceptibility is expected. The influence of LaCo 12 O 19 impurity is difficult to estimate precisely at this stage because of the lack of its magnetic data.…”

Section: Magnetic Propertymentioning

confidence: 99%

High‐pressure synthesis, crystal structure, and magnetic property of LaCo₆O₁₁

Toda

Yamada

Kawaguchi

2022

Int J Ceramic Engine & Sci

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A novel cobalt oxide LaCo 6 O 11 has been synthesized under high pressure of 8 GPa, and its crystal structure and magnetic property have been investigated.Rietveld analysis using synchrotron X-ray powder diffraction data demonstrates that LaCo 6 O 11 crystallizes in the magnetoplumbite-derived structure as well as A 2+ Co 6 O 11 (A = Ca, Sr, Ba). Bond valence sum (BVS) calculation exhibits a substantial decrease in BVS of octahedral Co sites with itinerant electrons, whereas BVS at trigonal bipyramidal Co site with localized electrons is unchanged, indicating that the doped electrons are predominantly injected into the Co sites with electric conductivity. Magnetization measurement shows that the magnetic ground state of LaCo 6 O 11 is similar to the antiferromagnetic-like one in CaCo 6 O 11 . However, the absence of a field-induced ferrimagnetic transition in LaCo 6 O 11 indicates the robustness of the antiferromagnetic-like ground state. The difference in the magnetic state under the external magnetic field between LaCo 6 O 11 and CaCo 6 O 11 is attributed to the suppression of the ferromagnetic RKKY interaction because of the reduction in hole carrier density by La 3+ substitution for Ca 2+ .

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“…The detailed calculations of the excited state energy Δ and its volume dependence for LaCoO 3 have given the values Δð0Þ ≃ 230 K and dΔ/d lnV ≃ 29 Â 10 3 K ≃ À2.5 eV. [20,21] For PrCoO 3 compound, the present DFTþU calculations have provided the corresponding values Δð0Þ ≃ 570 K and dΔ/d lnV ≃ 29 Â 10 3 K ≃ À2.5 eV. Therefore, for boundary compounds LaCoO 3 and PrCoO 3 , the theoretical Δ were found substantially different, and in a qualitative agreement with the behavior of Δ in La 1Àx Pr x CoO 3 compounds for increasing concentration of Pr (Figure 11).…”

Section: Discussionmentioning

confidence: 99%

Effects of Temperature and Pressure on the Magnetic Properties of La_1–xPr_xCoO₃

Панфилов

Lyogenkaya

Grechnev

et al. 2020

Physica Status Solidi (b)

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For La1–xPrxCoO3 cobaltites (x = 0, 0.1, 0.2, and 0.3), the dependence of magnetic susceptibility χ(T) is studied in the temperature range 5–400 K. Also, the crystal structure of these cobaltites is investigated, and the effect of pressure up to 2 kbar on their susceptibility is measured at T=78, 150, and 300 K. The specific dependencies χ(T) and the large negative pressure effect are assumed to arise from Co3+ ions contribution to the total susceptibility evaluated using La1−xPrxAlO3 as a reference system. The obtained experimental data on temperature and pressure effects in magnetism are analyzed within a two‐level model with energy gap Δ between the ground state of the system with zero spin of Co3+ ions and the excited higher‐spin state. In this model, magnetism of Co3+ ions is determined by the temperature‐induced population of the excited state, and magnitude of the pressure effect is governed by the volume dependence of Δ. The results of the analysis, supplemented by the theoretical calculations of the electronic structures of LaCoO3 and PrCoO3, indicate significant increase in Δ with decrease in the unit cell volume both under hydrostatic pressure and by substituting La with Pr having a smaller ionic radius.

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Pressure effect on magnetic susceptibility of LaCoO3

Cited by 11 publications

References 45 publications

High‐Pressure Neutron Diffraction Study of LaCoO₃

High‐Pressure Neutron Diffraction Study of LaCoO₃

High‐pressure synthesis, crystal structure, and magnetic property of LaCo₆O₁₁

Effects of Temperature and Pressure on the Magnetic Properties of La_1–xPr_xCoO₃

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Pressure effect on magnetic susceptibility of LaCoO3

Cited by 11 publications

References 45 publications

High‐Pressure Neutron Diffraction Study of LaCoO3

High‐Pressure Neutron Diffraction Study of LaCoO3

High‐pressure synthesis, crystal structure, and magnetic property of LaCo6O11

Effects of Temperature and Pressure on the Magnetic Properties of La1–xPrxCoO3

Contact Info

Product

Resources

About

High‐Pressure Neutron Diffraction Study of LaCoO₃

High‐Pressure Neutron Diffraction Study of LaCoO₃

High‐pressure synthesis, crystal structure, and magnetic property of LaCo₆O₁₁

Effects of Temperature and Pressure on the Magnetic Properties of La_1–xPr_xCoO₃