Structure, magnetic and electrical transport properties of the perovskites La0.67−xEuxSr0.33MnO3

Dhahri, N.; Dhahri, A.; Dhahri, J.; Hlil, E.K.; Dhahri, E.

doi:10.1016/j.jmmm.2012.08.024

Cited by 26 publications

(11 citation statements)

References 56 publications

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“…The values of magnetization sensitivity dM/dT in the ferromagnetic region B and the magnetization sensitivity dM/dT at the transition temperature, Sc obtained from the experimental data are displayed in Table 1. Figure 1 shows the temperature dependence of magnetization M(T ) under an applied field of 500 Oe for the series La 0.67−x Eu x Sr 0.33 MnO 3 (x = 0.1 and x = 0.2) has been reported by us elsewhere [11].…”

Section: Resultsmentioning

confidence: 78%

“…Details of the sample preparation and structure characterization are described in a previous work [11] using of Eu 2 O 3 , La 2 O 3 , SrCO 3 and MnO 2 as reagents. Magnetic measurements were performed in a BS2 magnetometer developed in Louis Néel Laboratory at Grenoble, where we measured the magnetization versus applied magnetic field in a temperature range near T C .…”

Section: Methodsmentioning

confidence: 99%

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Magnetocaloric Effect in Perovskite Manganite La0.67−x Eu x Sr0.33MnO3

Dhahri

Abassi

Hlil

et al. 2015

J Supercond Nov Magn

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In this paper, the magnetocaloric effect of perovskite manganite La 0.67−x Eu x Sr 0.33 MnO 3 (x = 0.1 and x = 0.2) has been investigated. From the measurement of isothermal magnetization around the Curie temperature, we have calculated the maximum isothermal magnetic entropy change The maximum magnetic entropy change S max M is found to increase with increasing of Eu content from 4.10 J/kg K for x = 0.1 J/kg K and 4.33 J/kg K for x = 0.2 upon 5 T applied field change. It is suggested that La 0.67−x Eu x Sr 0.33 MnO 3 are suitable candidates as refrigerants near room temperature region.

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Section: Resultsmentioning

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Magnetocaloric Effect in Perovskite Manganite La0.67−x Eu x Sr0.33MnO3

Dhahri

Abassi

Hlil

et al. 2015

J Supercond Nov Magn

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“…The significant difference between T ρ and T C values may be owing to several factors: (i) smaller crystallite size of sample than that measured using XRD, (ii) influence of extrinsic contributions such as a large number of grain boundaries, and (iii) spin-polarized tunnelling between FM grains through an insulating grain boundary layer, and so on. The discrepancy of the grain size may be that the size measured using SEM is for grains consisting of more than one crystallite [49]. …”

Section: Resultsmentioning

confidence: 99%

Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO ₆ material

Borchani¹,

Cheikhrouhou‐Koubaa

Megdiche

2017

R. Soc. open sci.

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Structural, magnetic, magnetocaloric, electrical and magnetoresistance properties of an LaNaMnMoO6 powder sample have been investigated by X-ray diffraction (XRD), magnetic and electrical measurements. Our sample has been synthesized using the ceramic method. Rietveld refinements of the XRD patterns show that our sample is single phase and it crystallizes in the orthorhombic structure with Pnma space group. Magnetization versus temperature in a magnetic applied field of 0.05 T shows that our sample exhibits a paramagnetic–ferromagnetic transition with decreasing temperature. The Curie temperature TC is found to be 320 K. Arrott plots show that all our double-perovskite oxides exhibit a second-order magnetic phase transition. From the measured magnetization data of an LaNaMnMoO6 sample as a function of the magnetic applied field, the associated magnetic entropy change |−ΔSM| and the relative cooling power (RCP) have been determined. In the vicinity of TC, |−ΔSM| reached, in a magnetic applied field of 8 T, a maximum value of ∼4 J kg−1 K−1. Our sample undergoes a large magnetocaloric effect at near-room temperature. Resistivity measurements reveal the presence of an insulating-metal transition at Tρ = 180 K. A magnetoresistance of 30% has been observed at room temperature for 6 T, significantly larger than that reported for the A2FeMoO6 (A = Sr, Ba) double-perovskite system.

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“…Recently, rare-earth perovskite manganites have been a very fertile ground for the discovery of many new physical phenomena, such as colossal magnetoresistance (CMR) effect [1][2][3][4]. The discovery sets off a wave of new study with a focus on various fabrication processes and novel physical devices of these materials [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Metastable magnetic behavior in La0.9Tb0.1MnO3

et al. 2015

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The linear and nonlinear magnetizations of La 0.9 Tb 0.1 MnO 3 at low temperatures were reported in detail. The temperature dependence of magnetization shows peaks at 50, 100 and 150 K, respectively. When LaMnO 3 is Tb-doped, its magnetic structure exhibits a canted antiparallel spin order. This is different from classical antiferromagnetic (AFM) in which the relaxation behavior takes place at about 150 K. At 50 K, Tb-doped LaMnO 3 exhibits canonical spin glass behavior, arising from the competition of exchange and super-exchange between spins. The peak at 100 K shows neither spin glass behavior nor canted AFM behavior. Its peak value increases with frequency increasing, and the transition temperature of the peak shifts to higher temperatures with frequency increasing. The study of aging behavior at 100 K shows a periodical variable metastability, which is ascribed to the competition between ferromagnetic (FM)-, AFM-and sinusoidal-order interactions. This work should shed a light on understanding the complex magnetic structure of the perovskite oxides.

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Structure, magnetic and electrical transport properties of the perovskites La0.67−xEuxSr0.33MnO3

Cited by 26 publications

References 56 publications

Magnetocaloric Effect in Perovskite Manganite La0.67−x Eu x Sr0.33MnO3

Magnetocaloric Effect in Perovskite Manganite La0.67−x Eu x Sr0.33MnO3

Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO ₆ material

Metastable magnetic behavior in La0.9Tb0.1MnO3

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Structure, magnetic and electrical transport properties of the perovskites La0.67−xEuxSr0.33MnO3

Cited by 26 publications

References 56 publications

Magnetocaloric Effect in Perovskite Manganite La0.67−x Eu x Sr0.33MnO3

Magnetocaloric Effect in Perovskite Manganite La0.67−x Eu x Sr0.33MnO3

Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO 6 material

Metastable magnetic behavior in La0.9Tb0.1MnO3

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Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO ₆ material