Large Magnetic Entropy Change in Pr2/3Sr1/3MnO3-CuO Composite at Room Temperature

Fkhar, L.; Mounkachi, O.; Maalam, K. El; Hamedoun, M.; Mahmoud, Abdelfattah; Boschini, Frèdéric; Kenz, A. El; Ali, Mustapha Ait; Hlil, E.K.; Xiao, Yunyun; Benyoussef, A.

doi:10.1007/s10948-019-5136-y

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…The addition of a secondary phase has the potential to improve the grain boundary effect in perovskite manganates [21]- [23]. Researchers have studied a range of composite perovskite manganite materials, including those incorporating Ag [24], NiO [25], ZnO [26], CuO [2], TiO2 [27], MgO [20], Ta2O5 [28].…”

Section: Introductionmentioning

confidence: 99%

“…The residual resistivity in the equation, denoted by 𝜌 0 , is caused by temperature-independent processes such as grain boundaries, domain walls, and vacancies. The term 𝜌 2 𝑇 2 represents electron-electron scattering, while the term 𝜌9 2 𝑇 92 is attributed to two-magnon scattering in the ferromagnetic state. However, this model cannot explain the increase in resistivity at low temperatures, suggesting that other factors may contribute to this behavior.…”

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confidence: 99%

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Regulating the Electron Transport Mechanism and Increasing Magnetoresistance: The Role of CuO Filler in La0.7Sr0.2Ca0.1MnO3 Grain Boundary

Zulkarnain

Imaduddin²,

Munazat

et al. 2023

Preprint

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Magnetoresistance in perovskite materials has been extensively studied due to their great potential in spintronics technology. Perovskite samples composite with metal oxides can modify electrical properties, which can subsequently improve LFMR under low magnetic fields. In this study, we investigate changes in electrical properties at different temperatures of polycrystalline (1-x)La0.7Sr0.2Ca0.1MnO3/xCuO (LC) composites, where x = 0, 0.05, 0.10, 0.15, and 0.20. Polycrystalline La0.7Sr0.2Ca0.1MnO3 (LSCMO) was synthesized using the sol-gel method and CuO powder as a filler was mixed with LSCMO using wet. The LC composite was then oven-dried to remove moisture, compacted at 10 MPa, and sintered at 1200°C for 12 hours. All samples in the LSCMO phase have a rhombohedral structure with space group R3c. The crystal structure parameters were studied using Rietveld refinement through GSAS II software. SEM results show that CuO is in the LSCMO grain boundary and confirmed by EDS. As the CuO composition increased, the magnetization decreased, as observed by VSM at room temperature. The electrical transport properties of pure LSCMO and LC composites were studied from 5 to 300 K characterized by a cryogenic magnetometer. LC resistivity is higher than LSCMO, and the more CuO content, the smaller the metal transition temperature. CuO present at the grain boundary can decrease the resistivity value as compared to LSCMO. Additionally, the CuO layer weakens spin polarized tunneling intergrain, ultimately impacting the magnetoresistance value. The highest magnetoresistance value is for the LC15 composite at a temperature of 5K with an external field of 2T at 28.5%.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Regulating the Electron Transport Mechanism and Increasing Magnetoresistance: The Role of CuO Filler in La0.7Sr0.2Ca0.1MnO3 Grain Boundary

Zulkarnain

Imaduddin²,

Munazat

et al. 2023

Preprint

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“…The researchers looked into a variety of magnet materials, such as magnetic alloys, manganites and others in order to develop and improve MR [29][30][31][32][33][34]. In traditional MCE, a reaction of adiabatic demagnetization occurs as the cooling action in MC material, which is carried out with sudden removal of H exe [35][36][37]. Quite opposite way, adiabatic magnetization can cool MC materials that increases by sudden increasing H exe applied on MC materials.…”

Section: Introductionmentioning

confidence: 99%

Strong Role of Calcination Temperature for Improving Magnetocaloric Effect in Nd0.5Sr0.5MnO3 Prepared via Combustion Technique

Hamad

Alamri

2021

Preprint

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In this work, phenomenological model (PM) is used to simulate the magnetocaloric effect (MCE) of Nd0.5Sr0.5MnO3 (NSMO) sample synthesized at various values of temperature of calcination (Tcal). The results showed that MCE of NSMO samples depends strongly on Tcal, achieving that a conventional MCE for nanocrystalline NSMO samples. However, the thermomagnetic behavior of bulk NSMO sample NSMO contains both conventional MCE and inverse MCE. MCE of NSMO improves powerfully with increasing Tcal. The calcination process is concluded as a powerful tool for improving MCE for NSMO. Especially, NSMO parameters in MCE of some published works are better, with a value equal to or greater than the corresponding MCE parameters in the same value of ΔH. MCE of NSMO system, particularly for nitrogen and hydrogen liquefaction, covers an excellent temperature range is of interest for MR.

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Structural, magnetic, and magnetocaloric properties of (1 − x)La0.7Ca0.3MnO3/(x)La0.7Ag0.3MnO3 composites

Yigiter

Pektas

Kolat

et al. 2022

J Mater Sci: Mater Electron

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Large Magnetic Entropy Change in Pr2/3Sr1/3MnO3-CuO Composite at Room Temperature

Cited by 11 publications

References 24 publications

Regulating the Electron Transport Mechanism and Increasing Magnetoresistance: The Role of CuO Filler in La0.7Sr0.2Ca0.1MnO3 Grain Boundary

Regulating the Electron Transport Mechanism and Increasing Magnetoresistance: The Role of CuO Filler in La0.7Sr0.2Ca0.1MnO3 Grain Boundary

Strong Role of Calcination Temperature for Improving Magnetocaloric Effect in Nd0.5Sr0.5MnO3 Prepared via Combustion Technique

Structural, magnetic, and magnetocaloric properties of (1 − x)La0.7Ca0.3MnO3/(x)La0.7Ag0.3MnO3 composites

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