Spin state transitions associated with magnetic phase separation in EuBaCo2O5+δ (δ = 0.47) cobaltite

Kumari, Archana; Dhanasekhar, C.; Das, A.

doi:10.1016/j.jallcom.2019.06.244

Cited by 11 publications

(21 citation statements)

References 39 publications

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“…show that there is significant thermal hysteresis, which confirms that the TN1 is the first order in nature. For instance, metamagnetic transitions are also observed in the EBCO, and more importantly, the metamagnetic transitions are shifted to the high field with decreasing T and are found to be incomplete at low T up to 7 T [19,31].…”

Section: Discussion and Concluding Remarksmentioning

confidence: 96%

“…The polycrystalline EuBaCo2O5+δ (δ = 0.47) cobaltite was prepared by conventional solid-state reaction method and the details can be found in Ref. 19. The temperature-dependent structural analyses were performed using the synchrotron X-ray powder diffraction (SXRPD) at TPS-09A beam line at the National Synchrotron Radiation Research Centre, Hsinchu, Taiwan.…”

Section: Experiments Detailsmentioning

confidence: 99%

“…The detailed ac M studies show the absence of conventional glass like feature in the EBCO and the detailed dc M studies show the signatures of phases coexistence [19]. To identify the kinetic arrest-induced phase coexistence, Banerjee et al proposed a special magnetic measurement protocol, i.e., cooling and heating in unequal fields ("CHUF") [22,23].…”

Section: Kinetic Arrest and Metastabilitymentioning

confidence: 99%

“…As discussed in ref. 19 that in AFM2 phase, the IS states of Co 3+ is gradually converted to LS state and the complete LS state of Co 3+ would be expected at low T. At low T one would expect that |∆SM| will tend to be constant (if one considers the contribution of pyramidal Co 3+ IS state). On contrary |∆SM| is increased with H below 60 K, where the magnetic glassy phase is observed.…”

Section: Magnetic Entropy Studiesmentioning

confidence: 99%

“…Our recent studies [19] on layered EuBaCo2O5+δ (δ = 0.47) (EBCO) cobaltite showed metal to insulator transition at 355 K (TMIT), paramagnet (PM) to FM transition at 267 K (TC), FM to AFM1 transition at 240 K (TN1) and AFM1-AFM2 transition at 204 K (TN2). The FM to AFM transition showed the significant first order thermomagnetic hysteresis effect and further, we showed that the AFM phases were shifted to low temperature under the external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic glassy state at low spin state of Co³⁺ in EuBaCo₂O_5+δ (δ = 0.47) cobaltite

Kumari¹,

Dhanasekhar²,

Chaddah³

et al. 2020

J. Phys.: Condens. Matter

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The magnetic glassy state is a fascinating phenomenon, which results from the kinetic arrest of the first order magnetic phase transition. Interesting properties, such as metastable magnetization and nonequilibrium magnetic phases, are naturally developed in the magnetic glassy state. Here, we report magnetic glass property in the low spin state of Co 3+ in EuBaCo2O5+δ (δ = 0.47) cobaltite at low temperature (T < 60 K). The measurements of magnetization under the cooling and heating in unequal fields, magnetization relaxation and thermal cycling of magnetization show the kinetic arrest of low magnetization state below 60 K. The kinetically arrested low temperature magnetic phase is further supported through the study of isothermal magnetic entropy, which shows the significant entropy change. The present results will open a new window to search the microscopic relation between the spin state transitions and the kinetic arrest induced magnetic glassy phenomena in complex materials.

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Section: Discussion and Concluding Remarksmentioning

confidence: 96%

Section: Experiments Detailsmentioning

confidence: 99%

Section: Kinetic Arrest and Metastabilitymentioning

confidence: 99%

Section: Magnetic Entropy Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magnetic glassy state at low spin state of Co³⁺ in EuBaCo₂O_5+δ (δ = 0.47) cobaltite

Kumari¹,

Dhanasekhar²,

Chaddah³

et al. 2020

J. Phys.: Condens. Matter

Self Cite

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Composition Dependence of Structural, Optical, Magnetic and Photodegradation Properties of Nanocrystalline NiO/CuO Heterostructured Powders

Tangcharoen

Klysubun

Kongmark

2022

Physica Status Solidi (a)

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Nanocrystalline NiO/CuO solid solutions and heterostructured powders are prepared by a sol–gel auto combustion method. Herein, the NiO/CuO compounds at various molar ratio, including 100/0, 97.5/2.5, 95/5, 92.5/7.5, 90/10, 80/20, 50/50, 20/80, 10/90, 5/95 and 0/100, are investigated. The structures, morphologies, optical, and magnetic properties of all samples are explored. The detailed structures of the NiO/CuO system are deduced from Rietveld refinements of X‐ray diffraction (XRD) data and the combination of experimental and simulation studies of X‐ray absorption spectroscopy (XAS) spectra. It is found that a small addition of CuO in NiO enhances the formation of rock salt CuxNi1–xO solid solutions with 0 ≤ x ≤ 0.1. The NiO/CuO composites with CuO mole fractions (m) of 20% ≤ m ≤ 95% are affirmed by the coexistence of NiO rock salt and CuO tenorite phases. The composites rich in CuO exhibit strong adsorption in the visible and ultraviolet spectral regions, while the absorption of composites rich in NiO is absent in certain regions of visible and infrared light. In addition, the superparamagnetism of NiO can be tuned to ferromagnetism by a small addition of CuO. The photocatalytic degradation efficiencies of rhodamine B, methylene blue, methyl orange, and methyl red over NiO/CuO reach 92%–97% within a period of 150 min under sunlight irradiation.

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Effect of nonstoichiometry on crystal structure, charge and spin states of cobalt ions in Tb1−Ba1+Co2−O5.5−: Neutron diffraction and soft X-ray absorption spectroscopy studies

Наумов

Воронин

Berger

et al. 2020

Journal of Alloys and Compounds

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Spin state transitions associated with magnetic phase separation in EuBaCo2O5+δ (δ = 0.47) cobaltite

Cited by 11 publications

References 39 publications

Magnetic glassy state at low spin state of Co³⁺ in EuBaCo₂O_5+δ (δ = 0.47) cobaltite

Magnetic glassy state at low spin state of Co³⁺ in EuBaCo₂O_5+δ (δ = 0.47) cobaltite

Composition Dependence of Structural, Optical, Magnetic and Photodegradation Properties of Nanocrystalline NiO/CuO Heterostructured Powders

Effect of nonstoichiometry on crystal structure, charge and spin states of cobalt ions in Tb1−Ba1+Co2−O5.5−: Neutron diffraction and soft X-ray absorption spectroscopy studies

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Spin state transitions associated with magnetic phase separation in EuBaCo2O5+δ (δ = 0.47) cobaltite

Cited by 11 publications

References 39 publications

Magnetic glassy state at low spin state of Co3+ in EuBaCo2O5+δ (δ = 0.47) cobaltite

Magnetic glassy state at low spin state of Co3+ in EuBaCo2O5+δ (δ = 0.47) cobaltite

Composition Dependence of Structural, Optical, Magnetic and Photodegradation Properties of Nanocrystalline NiO/CuO Heterostructured Powders

Effect of nonstoichiometry on crystal structure, charge and spin states of cobalt ions in Tb1−Ba1+Co2−O5.5−: Neutron diffraction and soft X-ray absorption spectroscopy studies

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Magnetic glassy state at low spin state of Co³⁺ in EuBaCo₂O_5+δ (δ = 0.47) cobaltite

Magnetic glassy state at low spin state of Co³⁺ in EuBaCo₂O_5+δ (δ = 0.47) cobaltite