Spontaneous and field-induced magnetic transitions in YBaCo2O5.5

Бобровский, В. И.; Казанцев, В. А.; Mirmelstein, A.; Mushnikov, N. V.; Proskurnina, N. V.; Воронин, В. И.; Pomjakushina, E.; Conder, K.; Podlesnyak, A.

doi:10.1016/j.jmmm.2008.09.030

Cited by 6 publications

(4 citation statements)

References 34 publications

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“…On the other hand the χ 𝑎𝑐 ′′ (𝑇) shows a frequency independent peak at 240 K, which is the onset of the AFM transition. Similar behavior also observed in YBaCo2O5.50 [31] and other cobaltites in this family [32].…”

Section: The χ 𝑎𝑐 ′supporting

confidence: 85%

Electron doping induced magnetic glassy state in phase separated YBaCo2O5.5-δ

Kumari

Dhanasekhar

Das

2019

Journal of Magnetism and Magnetic Materials

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The structural, magnetic and transport properties of the layered RBaCo2O5.5±δ cobaltites are sensitive to the oxygen stoichiometry. In this present study, we report the presence of a low-temperature magnetic glassy state in electrondoped polycrystalline YBaCo2O5.5 cobaltite. The ac magnetization studies show the absence of conventional spin glass features, while the various dc magnetization studies demonstrate the presence of non-equilibrium magnetic glassy state at low temperature. The magnetic glassy state of this sample results from the kinetic arrest of the first order ferro (or ferri) to antiferromagnetic transition. The role of electron doping in the occurrence of magnetic glassy phenomena is discussed in terms of magnetic phase separation involving the Co 3+ /Co 2+ clusters of the ferrimagnetic phase in the Co 3+ /Co 3+ antiferromagnetic matrix.

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Section: The χ 𝑎𝑐 ′supporting

confidence: 85%

Electron doping induced magnetic glassy state in phase separated YBaCo2O5.5-δ

Kumari

Dhanasekhar

Das

2019

Journal of Magnetism and Magnetic Materials

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“…After intensive research, it is now accepted that the correct orthorhombic space group allowing for the magnetic arrangements is in fact Pmma with a 2a P × 2a P × 2a P lattice and four non-equivalent sites for Co atoms. Furthermore, a second orthorhombic phase must be considered even at room temperature to correctly describe diffraction data [7,19]. On the other hand, the existence of a less distorted tetragonal phase in this system (P4/mmm) is usually associated with δ values below 0.5, for which there is no structural order of pyramids and octahedra.…”

Section: Resultsmentioning

confidence: 99%

“…The combined results from our previous and present study, through the use of cation substitution, have allowed us to disentangle the contributions and features which characterize each possible phase in the system. After these studies, as well as some others [15,16,8,9,19], we are certain that a two-phase scenario is needed to account for the complete set of experimental facts about this system. As we mentioned before, our aim was not to give details about each structural and magnetic phase, but to clarify the global behaviour of these cobaltites.…”

Section: Discussionmentioning

confidence: 99%

Enhancing spin state phase separation by strontium addition in the Y (Ba_1−xSr_x)Co₂O_5.5layered cobaltite

Aurelio

Curiale

Sánchez

et al. 2009

J. Phys.: Condens. Matter

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In this paper we present a neutron diffraction study of the effects of replacing Ba with smaller Sr cations in the layered cobaltite YBaCo(2)O(5+δ) for δ≈0.5. Neutron thermodiffractograms are reported in the temperature range 20 K≤T≤300 K, as well as high-resolution neutron diffraction experiments at selected temperatures. The systematic refinement of the series of samples with Sr substituting at the Ba site permits the understanding of the complex magnetic behaviour of this system, and reinforces a two-phase scenario for the parent compound. We have found that Sr addition destabilizes the ferrimagnetic spin state ordered phase, as well as the '122' order characteristic of cobaltites with δ = 0.5, favouring instead a tetragonal and less ordered structure.

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“…Taskin et al have reported that the concentration of lattice oxygen was closely related to the Ln 3+ ionic radius [26]. Although, the smaller Ln 3+ corresponds to the greater oxygen vacancies, which tends to result in various superstructures and phase instability, especially for YBCO [21,27,28]. Therefore, the LnBCO materials with larger Ln 3+ ions are more suitable for the SDC-LnBCO dual phase After densification, these samples exhibit different microstructures.…”

Section: Oxygen Permeation Flux Measurementmentioning

confidence: 99%

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

Chen

Zhao

Xie

et al. 2014

Ionics

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Ce 0.8 Sm 0.2 O 2 − δ -LnBaCo 2 O 5 + δ (SDC-LnBCO, Ln=La, Nd, Sm, and Y) composites were prepared and characterized as dense ceramic membranes for oxygen separation. Ce 0.8 Sm 0.2 O 2−δ (SDC) shows a good chemical compatibility with LaBaCo 2 O 5+δ (LBCO), NdBaCo 2 O 5+δ (NBCO), and SmBaCo 2 O 5+δ (SBCO), while a little of impurity is detected in the sample with YBaCo 2 O 5+δ (YBCO). The SDC-SBCO and SDC-YBCO samples exhibit larger grain size than SDC-LBCO and SDC-NBCO. The incorporation of SDC increases the structural stability and decreases the thermal expansion coefficient of LnBCO at high temperature. The oxygen permeation flux of SDC-LnBCO dual-phase membrane decreases with decreasing Ln 3+ radius, which is 2.57×10 −7 , 1.58×10 −7 , 8.05×10 −8 , and 7.57×10 −8 mol cm −2 s −1 at 925°C for SDC-LBCO, SDC-NBCO, SDC-SBCO, and SDC-YBCO membranes, respectively. Increasing the flow rate of feeding and sweeping gas can create oxygen partial pressure gradient, and thus, increase the oxygen permeability. These results indicate that SDC-LBCO and SDC-NBCO composites are promising candidates for oxygen permeation membrane.

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Spontaneous and field-induced magnetic transitions in YBaCo2O5.5

Cited by 6 publications

References 34 publications

Electron doping induced magnetic glassy state in phase separated YBaCo2O5.5-δ

Electron doping induced magnetic glassy state in phase separated YBaCo2O5.5-δ

Enhancing spin state phase separation by strontium addition in the Y (Ba_1−xSr_x)Co₂O_5.5layered cobaltite

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

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Spontaneous and field-induced magnetic transitions in YBaCo2O5.5

Cited by 6 publications

References 34 publications

Electron doping induced magnetic glassy state in phase separated YBaCo2O5.5-δ

Electron doping induced magnetic glassy state in phase separated YBaCo2O5.5-δ

Enhancing spin state phase separation by strontium addition in the Y (Ba1−xSrx)Co2O5.5layered cobaltite

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

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Enhancing spin state phase separation by strontium addition in the Y (Ba_1−xSr_x)Co₂O_5.5layered cobaltite