Unconventional critical behavior near the phase transition temperature and magnetocaloric effect in La0.5Ca0.4Ag0.1MnO3 compound

Assoudi, N.; Smari, M.; Walha, I.; Dhahri, E.; Shevyrtalov, Sergey; Dikaya, Olga; Rodionova, Valeria

doi:10.1016/j.cplett.2018.06.008

Cited by 16 publications

(6 citation statements)

References 42 publications

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“…Triki et al [26] showed that the ferromagnet La 0.4 Ca 0.6 MnO 2.8 , 0.2 oxide belongs also to an unconventional model with β=0.79 and γ=0.71. Same results were found by Assoudi et al [17] for the La 0.5 Ca 0.4 Ag 0.1 MnO 3 manganite. Li et al [27] found that the intermetallic sample DyFeAl belongs to an unconventional model also, with β=0.48 and γ=1.33.…”

Section: Resultssupporting

confidence: 87%

“…We characterized the second-order phase transition around Curie temperature T C which will be described by three critical exponents β, γ, and δ; the spontaneous magnetization exponent β, the isothermal magnetic susceptibility exponent γ and the critical isotherm exponent δ. These parameters are expressed via the mathematical equations as following [15][16][17][18][19][20][21]:…”

Section: Resultsmentioning

confidence: 99%

“…Thus, this system belongs to an unconventional model with new critical exponents. We tried determining the new values of β and γ based on equations (1) and (2), which present an optimum fitting through using a self-consistent method [17,25,26]. Many trials were made till a convergence of these values was reached, i.e.…”

Section: Resultsmentioning

confidence: 99%

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Unconventional critical behavior of the magnetic refrigerant system Er_0.98□_0.02Co₂ around its ferromagnetic-paramagnetic transition

Hamdi¹,

Smari²,

Bajorek³

et al. 2020

Phys. Scr.

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Magnetic refrigeration is a promising energy efficient and environmentally friendly refrigeration technology. The major problem in magnetic refrigeration is to find working materials with a large magnetocaloric effect (MCE) in different temperatures regions. MCE is the reversible temperature change of a magnetic materials upon the application or removal of a magnetic field. Nanoscale magnetic materials are good candidates for magnetic refrigeration due to a presence of a large MCE in the superparamagnetic system and reduced hysteresis losses. The critical behavior of Er0.98□0.02Co2 intermetallic system has been investigated via isothermal magnetizations around its ferromagnetic-paramagnetic (FM-PM) transition at Curie temperature TC = 62 K. This study was performed through different methods; Arrott-Noakes technique, Kouvel-Fisher analysis, and critical isotherms procedure. All these models could not explain the behavior of the studied system, which suggest that it belongs to an unconventional critical behavior. The critical exponents of the magnetization β, for the temperature dependence of the spontaneous magnetization below Curie Temperature (TC), and γ for the magnetic susceptibility, and δ for the magnetic isotherm at TC were calculated. Based on Modified Arrott plots; Er0.98□0.02Co2 gives TC = 62.57 K ± 0.01 K with β = 0.68 ± 0.005 and TC = 62.59 K ± 0.01 K with γ = 0.88 ± 0.008. Using Kouvel-Fisher technique, we get TC = 62.66 K ± 0.06 K with β = 0.71 ± 0.01 and TC = 62.54 K ± 0.02 K with γ = 0.90 ± 0.06. The extracted value of δ from the critical isotherms and the Widom scaling relation are so close confirming that the obtained critical exponents are suitable and accurate within experimental error values. With 536.45 J kg−1 at 5 T of relative cooling power, Er0.98□0.02Co2 is very promising as magnetic refrigerant.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

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Unconventional critical behavior of the magnetic refrigerant system Er_0.98□_0.02Co₂ around its ferromagnetic-paramagnetic transition

Hamdi¹,

Smari²,

Bajorek³

et al. 2020

Phys. Scr.

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“…The relative cooling power, or RCP (Relative Cooling Power), which is defined as the product of the ∆𝑆 𝑀 𝑚𝑎𝑥 and the width at mid-height (δTFWHM) of the curve ΔSM(T, H), has been shown to be a helpful measure for assessing a material's suitability for magnetic refrigeration. The following relationship defines this metric, which represents the amount of heat that may be transported between a refrigerator's hot and cold sources [29][30][31].…”

Section: Resultsmentioning

confidence: 99%

Comparative examination of the physical parameters of the sol gel produced compounds La0.5Ag0.1Ca0.4MnO3 and La0.6Ca0.3Ag0.1MnO3

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Comparative examination of the physical parameters of the sol gel produced compounds La0.5Ag0.1Ca0.4MnO3 and La0.6Ca0.3Ag0.1MnO3

Rasheed

Assoudi

Chaabani

et al. 2022

Preprint

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In this paper, the physical characteristics of La0.5Ag0.1Ca0.4MnO3 and La0.6Ca0.3Ag0.1MnO3 compounds have been studied. Structural analysis by XRD showed that both samples crystallize in an orthorhombic structure. For the La0.5Ag0.1Ca0.4MnO3 sample it can be seen that there are two bands: the first is due to the stretching Mn-O bond the υS vibration mode, relates to the internal motion of a length-changing Mn-O, whereas the second corresponds to the υb bonding mode, which is sensitive to a change in the Mn-O-Mn angle. For the compound La0.6Ca0.3Ag0.1MnO3 the υb band is absent. The magnetic measurements show that the two compounds have a single transition from the PM state to the FM state with an increase in the Curie transition temperature Tc for the compound La0.6Ca0.3Ag0.1MnO3. Similarly, the substitution of silver in calcium increases the value of the magnetization at low temperature. We also studied the magnetocaloric effect of our compounds. This study shows a significant change in magnetic entropy ΔSM that took place around their magnetic transition temperatures Tc. Under the influence of a 5 T magnetic field. The largest fluctuation in magnetic entropy is in the order of -8.67 J/kg.K for the compound La0.6Ca0.3Ag0.1MnO3 this value is considered significant. The magnetocaloric results indicate that the compound La0.6Ca0.3Ag0.1MnO3 is the best sample which has a large RCP which suggests its good candidate in the field of magnetic cold. Based on the Banarjee criterion and Landau theory, a second-order transition is observed for both samples in the vicinity of the Curie transition TC. The experimentally obtained value of ΔSM is smaller than the theoretically calculated one, which proves that the transition is an unconventional transition even under the influence of a 5 T magnetic field.

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Unconventional critical behavior near the phase transition temperature and magnetocaloric effect in La0.5Ca0.4Ag0.1MnO3 compound

Cited by 16 publications

References 42 publications

Unconventional critical behavior of the magnetic refrigerant system Er_0.98□_0.02Co₂ around its ferromagnetic-paramagnetic transition

Unconventional critical behavior of the magnetic refrigerant system Er_0.98□_0.02Co₂ around its ferromagnetic-paramagnetic transition

Comparative examination of the physical parameters of the sol gel produced compounds La0.5Ag0.1Ca0.4MnO3 and La0.6Ca0.3Ag0.1MnO3

Comparative examination of the physical parameters of the sol gel produced compounds La0.5Ag0.1Ca0.4MnO3 and La0.6Ca0.3Ag0.1MnO3

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Unconventional critical behavior near the phase transition temperature and magnetocaloric effect in La0.5Ca0.4Ag0.1MnO3 compound

Cited by 16 publications

References 42 publications

Unconventional critical behavior of the magnetic refrigerant system Er0.98□0.02Co2 around its ferromagnetic-paramagnetic transition

Unconventional critical behavior of the magnetic refrigerant system Er0.98□0.02Co2 around its ferromagnetic-paramagnetic transition

Comparative examination of the physical parameters of the sol gel produced compounds La0.5Ag0.1Ca0.4MnO3 and La0.6Ca0.3Ag0.1MnO3

Comparative examination of the physical parameters of the sol gel produced compounds La0.5Ag0.1Ca0.4MnO3 and La0.6Ca0.3Ag0.1MnO3

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Unconventional critical behavior of the magnetic refrigerant system Er_0.98□_0.02Co₂ around its ferromagnetic-paramagnetic transition

Unconventional critical behavior of the magnetic refrigerant system Er_0.98□_0.02Co₂ around its ferromagnetic-paramagnetic transition