Structural, magnetic and magnetocaloric properties in La0.5−xRexCa0.5MnO3 manganites (x=0; 0.1 and Re=Gd, Eu and Dy)

Krichene, A.; Boujelben, W.; Cheikhrouhou, A.

doi:10.1016/j.jallcom.2012.09.036

Cited by 88 publications

(24 citation statements)

References 48 publications

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“…The maximum of intensity can be attributed to the CO transition T CO which is around 200 K. A previous study performed on Pr 0.4 Ca 0.6 MnO 3 compound has shown a similar behavior of temperature dependence of intensity, and the observed maximum of intensity was attributed to the CO temperature [8]. Thus, bismuth substitution enhances CO comparing to La 0.5 Ca 0.5 MnO 3 (T CO = 150 K) [1]. The broadening of H pp at low temperature can be attributed to the slowing down of spin fluctuations in the FM state.…”

Section: Resultssupporting

confidence: 50%

“….) are very interesting compounds, and they are the subject of several investigations, not only for their technological applications, but also for the complexity of behavior and the diversity of physical phenomena existing in such samples [1][2][3][4][5]. Generally, halfdoped manganites are characterized by charge ordering (CO) phenomenon which consists in having a real space ordering of Mn 4+ and Mn 3+ ions.…”

Section: Introductionmentioning

confidence: 99%

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Electron Spin Resonance Study of Polycrystalline La0.4Bi0.1Ca0.5MnO3

Krichene

Thaljaoui

Boujelben

2015

J Supercond Nov Magn

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We have inspected the magnetic properties of polycrystalline La 0.4 Bi 0.1 Ca 0.5 MnO 3 using electron spin resonance (ESR) in the temperature range 150-280 K. The temperature dependence of magnetization indicates that the Curie temperature is T C = 225 K. ESR spectra revealed that the sample is not completely paramagnetic above its Curie temperature through the presence of ferromagnetic interactions in the temperature range 225-270 K which can be attributed to the presence of Griffiths phase in this temperature range. The sample becomes completely paramagnetic above 270 K. The presence of Griffiths phase can be attributed to the disorder induced by the 6s 2 lone pair electrons of Bi 3+ ions.

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Section: Resultssupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Electron Spin Resonance Study of Polycrystalline La0.4Bi0.1Ca0.5MnO3

Krichene

Thaljaoui

Boujelben

2015

J Supercond Nov Magn

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“…have attracted much attention due to their interesting magnetic properties and practical applications in a wide spectrum of industries [1][2][3][4][5][6]. Moreover, their extraordinary chemical stability and tunable phase transitions are also added advantages to choose manganites for technological applications [7][8].…”

Section: Introductionmentioning

confidence: 99%

Structural distortion effect on the magnetization and magnetocaloric effect in Pr modified La0.65Sr0.35MnO3 manganite

Anwar

Ahmed

Koo

2014

Journal of Alloys and Compounds

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“…Recently, large values of MCE are observed in the perovskite manganese oxides [8][9][10][11]. The research is very interesting in the system La 1Àx Ca x MnO 3 , which is characterized by rather large values of MCE and adjustable temperatures of phase transitions [7,[12][13][14]. For La 08 Ca 0.2 MnO 3 elaborated by sol-gel method, the DS M under an applied field of 1.5 T reaches 5.5 J kg À1 K À1 , around its Curie temperature T C ¼ 230 K [15].…”

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Magnetocaloric effect near room temperature in (1 − y)La_0.8Ca_0.05K_0.15MnO₃/yLa_0.8K_0.2MnO₃ composites

Gargouri¹,

M'nasri²,

Cheikhrouhou‐Koubaa³

et al. 2014

Physica Status Solidi (a)

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Magnetic and magnetocaloric properties of (1 − y) La0.8Ca0.05K0.15MnO3/yLa0.8K0.2MnO3 with y = 0.25, 0.5, and 0.75 composites were investigated. Our composites will be designated by CM1 (y = 0.25), CM2 (y = 0.5), and CM3 (y = 0.75). X‐ray diffraction pattern show that La0.8Ca0.05K0.15MnO3 and La0.8K0.2MnO3 samples, elaborated using the solid state reaction at high temperature, are single phase without any detectable impurity and crystallize in the rhombohedral system with Rtrue3¯c space group. The temperature dependence of the magnetization M(T) in the temperature range 200–350 K shows that La0.8Ca0.05K0.15MnO3 and La0.8K0.2MnO3 samples exhibit a paramagnetic–ferromagnetic transition while decreasing temperature, with a Curie temperature TC increasing with K amount and reaching around 300 K for x = 0.2. The field dependence of the magnetization M(H) confirms the ferromagnetic behavior at low temperatures observed in the M(T) curves. The maximum of the magnetic entropy change ΔSnormalMmax is found to be 5.32 and 4.37 J kg−1 K−1 under a magnetic field change of 5 T for La0.8Ca0.05K0.15MnO3 and La0.8K0.2MnO3, respectively. Magnetic entropy change versus temperatures reveals that the composite CM2 with y = 0.5 exhibits the best value for the relative cooling power (RCP) of 270 J kg−1 under a magnetic field change of 5 T. For y = 0.25 and 0.75, the RCP is found to be around 227.5 J kg−1 under a magnetic field change of 5 T for both of them. The RCP value of 270 J kg−1 for CM2, which is around 66% of that observed in pure Gd makes our composite a potential candidate for magnetic refrigeration around room temperature.

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Structural, magnetic and magnetocaloric properties in La0.5−xRexCa0.5MnO3 manganites (x=0; 0.1 and Re=Gd, Eu and Dy)

Cited by 88 publications

References 48 publications

Electron Spin Resonance Study of Polycrystalline La0.4Bi0.1Ca0.5MnO3

Electron Spin Resonance Study of Polycrystalline La0.4Bi0.1Ca0.5MnO3

Structural distortion effect on the magnetization and magnetocaloric effect in Pr modified La0.65Sr0.35MnO3 manganite

Magnetocaloric effect near room temperature in (1 − y)La_0.8Ca_0.05K_0.15MnO₃/yLa_0.8K_0.2MnO₃ composites

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Structural, magnetic and magnetocaloric properties in La0.5−xRexCa0.5MnO3 manganites (x=0; 0.1 and Re=Gd, Eu and Dy)

Cited by 88 publications

References 48 publications

Electron Spin Resonance Study of Polycrystalline La0.4Bi0.1Ca0.5MnO3

Electron Spin Resonance Study of Polycrystalline La0.4Bi0.1Ca0.5MnO3

Structural distortion effect on the magnetization and magnetocaloric effect in Pr modified La0.65Sr0.35MnO3 manganite

Magnetocaloric effect near room temperature in (1 − y)La0.8Ca0.05K0.15MnO3/yLa0.8K0.2MnO3 composites

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Magnetocaloric effect near room temperature in (1 − y)La_0.8Ca_0.05K_0.15MnO₃/yLa_0.8K_0.2MnO₃ composites