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- W2914417963 abstract "We compare the impact of hydrostatic pressure on the magnetic and magnetocaloric properties in monovalent alkali earth ion-doped polycrystalline La1–xNaxMnO3 (x = 0.05, 0.10). X-ray absorption spectra of Mn L3,2 edges reveal the presence of Mn4+ in these doped ferromagnetic samples. Ferromagnetic Curie temperature (TC) obtained from the temperature dependence of magnetization is 249.7 K for the x = 0.05 and 269.6 K for x = 0.1 samples in ambient pressure. A magnetic field change of 3T causes an adiabatic temperature change of ΔTad = 2.8 and 2.0 K for x = 0.05 and 0.1, respectively, at their respective TCs. On the other hand, application of 1.1 GPa hydrostatic pressure not only causes a huge shift in TC toward higher temperature (ΔTC ≈ 17.9 and 16.3 K for x = 0.05 and x = 0.1, respectively) but also enhances total entropy change (ΔS) for x = 0.1, while not affecting ΔS for x = 0.05. Specific heat and linear thermal expansion coefficient measurements suggest a possibility of structural transition below the paramagnetic–ferromagnetic transition in x = 0.1, which is absent in x = 0.05. Pressure-driven enhancement of structural transition temperature could be a possible origin of the enhanced magnetocaloric effect in x = 0.1." @default.
- W2914417963 created "2019-02-21" @default.
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- W2914417963 date "2019-01-24" @default.
- W2914417963 modified "2023-10-14" @default.
- W2914417963 title "Enhanced Magnetocaloric Effect Driven by Hydrostatic Pressure in Na-Doped LaMnO<sub>3</sub>" @default.
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- W2914417963 doi "https://doi.org/10.1021/acs.jpcc.8b09964" @default.
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