Magnetocaloric effect in charge ordered Nd0.5Ca0.5MnO3 manganite
Magnetocaloric effect in charge ordered Nd0.5Ca0.5MnO3 manganite
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DOI：
10.1063/1.2827117
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发表时间：
2008-01
影响因子：
3.2
通讯作者：
S. Karmakar;E. Bose;S. Taran;B. Chaudhuri;C. P. Sun;Hung-Duen Yang
中科院分区：
文献类型：
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作者：
S. Karmakar;E. Bose;S. Taran;B. Chaudhuri;C. P. Sun;Hung-Duen Yang
在多晶 Nd0.5Ca0.5MnO3 (NCMO) 锰酸盐体系中，在三个明确的温度区间（区域 I：2–115 K、区域 II：电荷级转变 TCO 和区域 III：室温附近）观察到磁热效应 (MCE)，在 TCO∼250 K 温度下表现出一级 (CO) 转变。 ΔSM(H) 的幅度增加 与施加的磁场单调，但即使在高达 60 kOe 的磁场下也不会达到饱和。在三个给定的温度范围内，发现磁滞和热滞可以忽略不计，这满足了使用NCMO作为磁制冷的有效磁热材料的要求。
The magnetocaloric effect (MCE) has been observed in three well-defined temperature intervals (region I: 2–115 K, region II: around charge order transition TCO, and region III: around room temperature) in polycrystalline Nd0.5Ca0.5MnO3 (NCMO) manganite system showing a first order (CO) transition at a temperature, TCO∼250 K. The magnitude of ΔSM(H) increases monotonically with applied magnetic field but does not reach saturation even at fields as high as 60 kOe. In the three given temperature regions, negligible magnetic and thermal hysteresis are found, which satisfies the requirements of using NCMO as an effective magnetocaloric material for magnetic refrigeration.