Investigation of the critical properties near room temperature in La0.7Ca0.2Ba0.1MnO3 manganite

Ezaami, A.; Sellami-Jmal, E.; Cheikhrouhou‐Koubaa, W.; Hlil, E.K.; Cheikhrouhou, A.

doi:10.1007/s10854-017-6382-z

Cited by 11 publications

(2 citation statements)

References 43 publications

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“…Further, the KF method is employed to obtain accurate values of the critical exponents. The KF method is expressed as follows [33]:…”

Section: Resultsmentioning

confidence: 99%

Observation of Griffiths phase, critical exponent analysis and high magnetocaloric effect near room temperature at low magnetic field in V-doped La_0.7Sr_0.3MnO₃

Kumar¹,

Jose²,

Jinu³

et al. 2022

J. Phys. D: Appl. Phys.

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We report on observation of Griffiths phase, high magnetocaloric properties at low magnetic fields and temperature dependent critical exponents of La0.7Sr0.3VxMn1-xO3 (x=0, 0.05 & 0.1) perovskite bulk materials. The Curie temperature (TC) of pure La0.7Sr0.3MnO3 is seen to be 368.7 K and decreases towards room temperature (342.2 K) by 10 mol% vanadium doping at the Mn site. Vanadium doping leads to enhancement in magnetic entropy change (-SM) from 1 Jkg-1K-1to 1.41 Jkg-1K-1. Vanadium doping at Mn site leads to the formation of Griffiths phase, a magnetic disorder due to the co-existence of paramagnetic matrix and short range ferromagnetic clusters. X-ray photoelectron spectroscopy analysis confirm the presence of mixed valance V4+/V5+along with Mn3+/ Mn4+ ions contributing to various double exchange interactions. Nature of phase transitions and magnetic interactions are analyzed by evaluating critical exponents and. All the samples show second-order ferromagnetic (FM) to paramagnetic (PM) phase transition, confirmed from the modified Arrott’s plots and critical exponent analysis carried out using Kouvel-Fisher method. Enhancement in magnetic entropy change along with the decrease in Curie temperature towards room temperature by vanadium doping in the La0.7Sr0.3MnO3 oxides indicates the possible application of these materials for the magnetic refrigeration at low magnetic fields.

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“…Further, the KF method is employed to obtain accurate values of the critical exponents. The KF method is expressed as follows [33]:…”

Section: Resultsmentioning

confidence: 99%

Observation of Griffiths phase, critical exponent analysis and high magnetocaloric effect near room temperature at low magnetic field in V-doped La_0.7Sr_0.3MnO₃

Kumar¹,

Jose²,

Jinu³

et al. 2022

J. Phys. D: Appl. Phys.

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“…的磁相变临界行为进行分析 [41] 可知, 其临界行为均体现了典型双交换作用性质的3D-Heisenberg 模型, 但接近电荷有序相区域(0.29)可能受到部分电荷有序相中反铁磁相互作用的影响. 而Ho等 [42] 对相同成分的多晶材料的研究发现, 空穴浓度为 0.29的样品呈现出长程相互作用的平均场模型. 这可能是由于其更加接近电荷有序相, 而超交换作用程略长于双交换作用 [35] , 相干长度更易达到晶粒尺度范围从而转变为平均场模型.…”

Section: 钙钛矿锰氧化物的磁相变临界行为研究概况unclassified

Research progress of critical behaviors and magnetocaloric effects of perovskite manganites

Zhang¹,

Piao²,

Zhang³

et al. 2021

Acta Phys. Sin.

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Hole-doped perovskite-type manganites have received intensive attention due to their intriguing physical phenomena such as giant magnetocaloric effect and magnetic-phase transitions. However, the mechanism of internal ferromagnetic interaction still needs to be further explored due to the complex natures of competing double-exchange (DE) and super-exchange (SE) interaction, Jahn-Teller (JT) polaron localization, charge ordering, and phase separation scenarios. Critical exponent analysis near magnetic phase transition is a powerful tool to investigate the details of the ferromagnetic interactions and has been used frequently in various magnetocaloric materials. In this article, the critical behavior analyses of perovskite manganites in recent years are comprehensively reviewed. A large number of studies have shown that even in single-phase materials with uniform structure and composition, the critical behavior can be affected by multiple factors such as grain boundary density and the degree of disorder, making them difficult to fully describe the intrinsic ferromagnetism. In this review, firstly, the critical behaviors of typical manganites with different bandwidths in single crystal and polycrystalline are discussed. In a double-exchange dominated system such as La-Sr-Mn-O, short-range 3D-Heisenberg model is basically in good accordance with optimally-doped single crystal sample. However, it would be replaced by long-range mean-field critical behavior in polycrystalline sample when the correlation length exceeds the crystallite size. In a typical intermediate bandwidth system such as La-Ca-Mn-O exhibiting a complex phase diagram described by competing SE/DE interactions, JT polaron localization/delocalization, and Griffith phase disorder, the critical exponent can vary from 3D-Heisenberg model to tricritical mean-field model, for the crossover from first to second order phase transition. Secondly, the studies of elements doping and different fabrication methods indicate that the critical behavior of manganites can be effectively modulated, and vary between different theoretical models including even nonuniversal exponent for highly disordered magnetic system. In the following part, the influence of magnetic field on the critical behavior and field induced crossover phenomena of La-Ca-Mn-O system near tricritical point is analyzed and discussed in detail. Furthermore, the magnetocaloric effects of materials near the tricritical point collected in many studies are listed and compared with each other. Excellent magnetocaloric properties with high magnetic entropy change and relative cooling power in plenty of researches indicate that ideal magnetocaloric material would be very likely to be found in the materials near the tricritical point, which lay at the borderline between first-order and second-order phase transition. Consequently, it is suggested that perovskite manganites are still quite promising in the potential magnetic refrigeration applications, and need to be further developed.

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Enhanced magnetocaloric properties with a tunable Curie temperature in (1 − x)La0.55 □ 0.1Ca0.35MnO3/xLa0.7Ca0.2Sr0.1MnO3 system (0 ≤ x ≤ 1)

Ezaami¹,

Sellami-Jmal²,

Cheikhrouhou‐Koubaa³

et al. 2017

J Mater Sci: Mater Electron

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Investigation of the critical properties near room temperature in La0.7Ca0.2Ba0.1MnO3 manganite

Cited by 11 publications

References 43 publications

Observation of Griffiths phase, critical exponent analysis and high magnetocaloric effect near room temperature at low magnetic field in V-doped La_0.7Sr_0.3MnO₃

Observation of Griffiths phase, critical exponent analysis and high magnetocaloric effect near room temperature at low magnetic field in V-doped La_0.7Sr_0.3MnO₃

Research progress of critical behaviors and magnetocaloric effects of perovskite manganites

Enhanced magnetocaloric properties with a tunable Curie temperature in (1 − x)La0.55 □ 0.1Ca0.35MnO3/xLa0.7Ca0.2Sr0.1MnO3 system (0 ≤ x ≤ 1)

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Investigation of the critical properties near room temperature in La0.7Ca0.2Ba0.1MnO3 manganite

Cited by 11 publications

References 43 publications

Observation of Griffiths phase, critical exponent analysis and high magnetocaloric effect near room temperature at low magnetic field in V-doped La0.7Sr0.3MnO3

Observation of Griffiths phase, critical exponent analysis and high magnetocaloric effect near room temperature at low magnetic field in V-doped La0.7Sr0.3MnO3

Research progress of critical behaviors and magnetocaloric effects of perovskite manganites

Enhanced magnetocaloric properties with a tunable Curie temperature in (1 − x)La0.55 □ 0.1Ca0.35MnO3/xLa0.7Ca0.2Sr0.1MnO3 system (0 ≤ x ≤ 1)

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Observation of Griffiths phase, critical exponent analysis and high magnetocaloric effect near room temperature at low magnetic field in V-doped La_0.7Sr_0.3MnO₃

Observation of Griffiths phase, critical exponent analysis and high magnetocaloric effect near room temperature at low magnetic field in V-doped La_0.7Sr_0.3MnO₃