Structural and magnetic effects on thermal emittance of La1−xSrxMnO3 from the first principles calculation
Structural and magnetic effects on thermal emittance of La1−xSrxMnO3 from the first principles calculation
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DOI：
10.1016/j.jmmm.2015.04.070
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发表时间：
2015-09
影响因子：
2.7
通讯作者：
Jiangpeng Liu;F. Tang;H. Xue;W. Lu;Yudong Feng
中科院分区：
文献类型：
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作者：
Jiangpeng Liu;F. Tang;H. Xue;W. Lu;Yudong Feng
采用广义梯度近似（GGA）交换关联泛函方法计算了La 1 − xSrxMnO 3（LSMO）的热发射率。利用复介电函数系统地研究了LSMO的结构和磁性对热发射率的影响。结果表明，在相同温度下，正交相结构的LSMO比菱方相结构的LSMO具有更高的热发射率。当考虑LSMO的磁性随温度变化时，磁性差对热发射率的影响较大，其中La_（0.75）Sr_（0.25）MnO_3的热发射率变化幅度最大，分别为x =0，0.2，0.25，0.5。结果表明，LSMO材料的热发射率在低温时较低，而在高温时较高，这是由于LSMO材料具有金属-绝缘体相变的可变热发射率特性，使其成为一种有潜力的热控材料。
Generalized gradient approximation (GGA) exchange-correlation functional was used in the first-principles method to calculate thermal emittance of La1−xSrxMnO3(LSMO). The effects of structure and magnetism on thermal emittance of LSMO were systematically investigated by the complex dielectric function. It is found that the LSMO with orthorhombic structure has a higher thermal emittance than that with rhombohedral structure at the same temperature. When the magnetism varying with temperature of LSMO is put into consideration, the magnetic different make a significant change on thermal emittance and the variation of thermal emittance of La0.75Sr0.25MnO3is the biggest amongx=0, 0.2, 0.25, 0.5. It is found that thermal emittance have a low value at the low temperature and have a high value at the high temperature, due to the unique feature of variable thermal emittance based on metal-insulator transition, which makes LSMO attractive as potential thermal control materials.