Appearance of Griffiths phase in La0.62Er0.05Ba0.33Fe0.2Mn0.8O3 manganite

Abassi, Mounira; Dhahri, N.; Tahri, Tarek; Dhahri, J.; Taïbî, K.; Hlil, E.K.

doi:10.1016/j.ceramint.2014.09.134

Cited by 14 publications

(4 citation statements)

References 44 publications

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“…The temperature dependence of the specific heat of the LBCMO sample is shown in Fig. 7 in the temperature range of 200-350 K in a zero magnetic field and in a magnetic field of 0 to 5 T calculated from formula (18). As can be seen, with an increase in the magnetic field, the transition temperature shifts toward higher values.…”

Section: Transport-entropy Correlationmentioning

confidence: 91%

“…Magnetization as a function of temperature M(T ) and isothermal magnetization M(µ 0 H, T ) was performed using an extraction magnetometer. The magnetocaloric effect was estimated in terms of isothermal magnetic entropy change (ΔS M ) using M−µ 0 H−T data and Maxwell's relation: 17,18 ΔS M ðT; μ 0 HÞ ¼…”

Section: Methodsmentioning

confidence: 99%

“…Using the Fisher-Langer relation, 31 which states that the magnetic component of the specific heat ΔC p and the temperature coefficient of resistivity dρ/dT are proportional to each other, i.e., ΔC p , which confirms the correlation between the electrical and thermal properties of manganites. 32 Using this proportionality formula (18) and the results presented in Fig. 11 it's possible to reveal the correlations between the electrical resistivity and the specific heat near the phase transition temperature.…”

Section: Transport-entropy Correlationmentioning

confidence: 99%

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Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La_0.67Ba_0.1Ca_0.23MnO₃

et al. 2016

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An investigation of the magnetic, magnetocaloric and electrical behavior of La(0.67)Ba(0.1)Ca(0.23)MnO3 is presented. The variation of magnetization (M) vs. temperature (T) under 1, 2, 3, 4 and 5 T magnetic fields reveals a ferromagnetic-paramagnetic transition. Magnetic entropy change, relative cooling power and specific heat for magnetic field variation were conducted using a phenomenological model. Moreover, the electrical resistivity is fitted with the phenomenological percolation model which is based on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions. The equation of the form ΔS(P)(M)(T,H) = - α∫(H)(0)[∂(ln)(ρ)/∂(T)](H)(dH) relates the magnetic order to the transport behavior of our sample. The results show that the as obtained magnetic entropy change values are similar to those determined using data obtained from the investigation of the dependence of magnetization on the temperature and magnetic field.

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Section: Transport-entropy Correlationmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Transport-entropy Correlationmentioning

confidence: 99%

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Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La_0.67Ba_0.1Ca_0.23MnO₃

et al. 2016

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“…Additionally, we can also calculate the grain size using a scanning electron microscopy (SEM). As shown in Table 2, the average grain size (D SC ) obtained from the XRD peaks using the Scherrer formula (1) is significantly smaller than the values determined by SEM, which indicates that each particle observed by SEM consists of several crystallized grains [31]. Furthermore, to find close values, we have used Williamson-Hall approach for deconvoluting size and strain contribution to the x-ray line broadening.…”

Section: Morphological Characterization and Structural Informationmentioning

confidence: 99%

Effect of Fe Substitution on the Physical Properties of La0.62Er0.05Ba0.33Mn1−xFexO3(x = 0.00, 0.05 and 0.15)

Abassi

2018

J Supercond Nov Magn

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Morphology, magnetic and magnetocaloric properties of La 0.62 Er 0.05 Ba 0.33 Mn 1−x Fe x O 3 (x = 0.00, 0.05 and 0.15) were experimentally investigated. Solid-state reaction method was used in the preparation of the samples. The microstructure of the samples was determined by scanning electron microscopy (SEM). From the XRD study, it has been found that all samples are single-phased and crystallized in the rhombohedral structure with the R3-c space group. For x = 0.05 and 0.15, a steep drop of zero field-cooled (ZFC) magnetization at low temperature signifies the formation of cluster-or spinglass state. This is caused by the competition between the ferromagnetic and antiferromagnetic interaction. A sensitive response to substituting Fe for Mn is observed in the magnetic and magnetocaloric properties. We found that Fe doping is powerful enough to reduce Curie temperature T C and it brings about cluster glass behaviours. The magnetocaloric effect is calculated from the measurement of initial isothermal magnetization versus magnetic field at various temperatures. The maximum entropy change S max M reaches the highest values of 3.31, 3.12, and 2.57 J/kg K in magnetic field. However, the relative cooling power decreases with Fe content from x = 227.44 to 188.68 J/kg for x = 0.00 to x = 0.15 compositions, respectively.

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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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Appearance of Griffiths phase in La0.62Er0.05Ba0.33Fe0.2Mn0.8O3 manganite

Cited by 14 publications

References 44 publications

Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La_0.67Ba_0.1Ca_0.23MnO₃

Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La_0.67Ba_0.1Ca_0.23MnO₃

Effect of Fe Substitution on the Physical Properties of La0.62Er0.05Ba0.33Mn1−xFexO3(x = 0.00, 0.05 and 0.15)

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

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Appearance of Griffiths phase in La0.62Er0.05Ba0.33Fe0.2Mn0.8O3 manganite

Cited by 14 publications

References 44 publications

Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La0.67Ba0.1Ca0.23MnO3

Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La0.67Ba0.1Ca0.23MnO3

Effect of Fe Substitution on the Physical Properties of La0.62Er0.05Ba0.33Mn1−xFexO3(x = 0.00, 0.05 and 0.15)

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

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Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La_0.67Ba_0.1Ca_0.23MnO₃

Theoretical investigations on the magnetocaloric and electrical properties of a perovskite manganite La_0.67Ba_0.1Ca_0.23MnO₃