Investigations on Thermomagnetic Properties of YbFe2As2

Hamad, Mahmoud A.; Hemeda, O. M.; Alamri, Hatem R.; Mohamed, Ashraf M.

doi:10.1007/s10909-020-02528-w

Cited by 11 publications

(2 citation statements)

References 61 publications

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“…In order to calculate the total mass of quasiparticles from all Fermi pockets, a direct measurement of the normal RECEIVED state density of states in high-temperature superconductors has been lacking [32]. In another recent study, the application of YbFe 2 As 2 is reported that it can be used as a material for magnetic refrigerators that works well over a wide temperature range, spanning from 0 to 50 K. This suggests that YbFe 2 As 2 is regarded as the material with the magnetocaloric effect for liquefying helium gas [33].…”

Section: Introductionmentioning

confidence: 99%

Investigation on specific heat and Raman spectroscopy of YbFe₂As₂

Ghosh,

et al. 2024

Phys. Scr.

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We hereby present a comprehensive study of polycrystalline YbFe2As2 which includes detailed investigation on the specific heat capacity and Raman spectroscopy measurements at high magnetic fields (up to 16T) and low temperatures. Low temperature X-ray diffraction investigations at 30 K on YbFe2As2 reveal an orthorhombic unit cell structure, which indicates structural transitions from monoclinic to orthorhombic as temperature decreases. In specific heat capacity measurements, a slope change is observed around 70 K. It may be a signature of spin density wave (SDW) phase transition. The specific heat data has been fitted in the temperature ranging from 20 to 90K. It has been found that linear coefficient of specific heat () is quite enhanced suggesting the existence of quasi particles with heavy effective mass. Its value changes slowly with magnetic field below 70 K. Raman spectra has been studied in the temperature range of 4 to 300 K. It is observed that there is a trend of shifting the B1G peak position in Raman Spectra on the higher side as the temperature decreases. A change of slope in shift of B1G vs temperature plot is noticed around 70 K suggesting phase transition which is consistent with specific heat and previous resistivity measurements. Overall, our results provide new insights into the physical properties and phase transitions of YbFe2As2.

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Section: Introductionmentioning

confidence: 99%

Investigation on specific heat and Raman spectroscopy of YbFe₂As₂

Ghosh,

et al. 2024

Phys. Scr.

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“…The need to solve the problem of emission of hazard gases, which come out of conventional vapor refrigerators, results in increased interest in functioning magnetic refrigerator (MR), the idea of which depends on functioning magnetocaloric effect (MCE) (Dhahri et al, 2014;El-Sayed and Hamad, 2019a;El-Sayed and Hamad, 2019b;Ahmed et al, 2021a, Ahmed et al, 2021bHamad et al, 2021;Jebari et al, 2021), because the MR provides high efficiency for cooling without any negative impact on the environment and has low energy consumption, availability of mechanical stability, and fewer noise events during cooling operation (Dhahri et al, 2015;Hamad, 2015a;ErchidiElyacoubi et al, 2018a, ErchidiElyacoubi et al, 2018bHamad et al, 2020;Sharma et al, 2020;Belhamra et al, 2021). MCE is described as a change in magnetic entropy (ΔS M ) with a variation in the external magnetic field (H ext ) exerted on the material, causing a change in temperature (Masrour et al, 2016;ErchidiElyacoubi et al, 2018c;Kadim et al, 2020, Kadim et al, 2021a, Kadim et al, 2021b.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Strong-Tuned Magnetocaloric Effect in La0.5Ca0.1Ag0.4MnO3

Hamad

Alamri

2022

Front. Mater.

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The magnetocaloric effect (MCE) of La0.5Ca0.1Ag0.4MnO3 (LCAMO) is simulated using a phenomenological model (PM). The LCAMO MCE parameters are calculated as the results of simulations for magnetization vs. temperature at different values of external magnetic field (Hext). The temperature range of MCE in LCAMO grew as the variation in Hext increased, eventually covering the room temperature at high Hext values. The MCE of LCAMO is tunable with the variation of Hext, proving that LCAMO is practically more helpful as a magnetocaloric (MC) material for the development of magnetic refrigerators in an extensive temperature range, including room temperature and lower and higher ones. The MCE parameters of LCAMO are practically greater than those of some MC samples in earlier works.

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Magnetocaloric Effect for La0.54Sr0.27Gd0.19MnO3 Nanoparticles at Room and Cryogenic Temperatures

Hamad

Alamri

2022

J Low Temp Phys

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The magnetic refrigerator (MR) has gained popularity due to its potential to improve the energy efficiency of refrigeration without the use of unsafe gas, as is the case with traditional gas compression techniques. Magnetocaloric lanthanum manganite investigation, particularly at room and cryogenic temperatures, shows favorable results for the development of MR. Previous thermodynamic models require a significant amount of time and effort to estimate the magnetocaloric effect (MCE). Consequently, we employ the phenomenological model (PM), which is simple and straightforward, requiring fewer parameters than many other modeling methods. We studied the magnetocaloric effect (MCE) of silica-coated La0.54Sr0.27Gd0.19MnO3 (LSGMO) nanoparticles via PM. According to PM results, MCE parameters were obtained as the consequences of the simulated magnetization of silica-coated LSGMO nanoparticles vs. temperature under 0.1 T a magnetic field. It is revealed that the MCE of silica-coated LSGMO nanoparticles covers a broad range of temperatures between 200 and 330 K. The comparison of MCE parameters for silica-coated LSGMO nanoparticles and some published works shows that silica-coated LSGMO nanoparticles are considerably larger than some of the MCE parameters in these published works. Finally, silica-coated LSGMO nanoparticles are suitable function materials in MR, especially at room and cryogenic temperatures, contributing to efficient MR.

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Investigations on Thermomagnetic Properties of YbFe2As2

Cited by 11 publications

References 61 publications

Investigation on specific heat and Raman spectroscopy of YbFe₂As₂

Investigation on specific heat and Raman spectroscopy of YbFe₂As₂

Investigations on Strong-Tuned Magnetocaloric Effect in La0.5Ca0.1Ag0.4MnO3

Magnetocaloric Effect for La0.54Sr0.27Gd0.19MnO3 Nanoparticles at Room and Cryogenic Temperatures

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Investigations on Thermomagnetic Properties of YbFe2As2

Cited by 11 publications

References 61 publications

Investigation on specific heat and Raman spectroscopy of YbFe2As2

Investigation on specific heat and Raman spectroscopy of YbFe2As2

Investigations on Strong-Tuned Magnetocaloric Effect in La0.5Ca0.1Ag0.4MnO3

Magnetocaloric Effect for La0.54Sr0.27Gd0.19MnO3 Nanoparticles at Room and Cryogenic Temperatures

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Investigation on specific heat and Raman spectroscopy of YbFe₂As₂

Investigation on specific heat and Raman spectroscopy of YbFe₂As₂