反钙钛矿化合物Ga1-xCMn3 +x（x=0，0.06，0.07和0.08）中具有大温度跨度的可逆室温磁热效应
Reversible room-temperature magnetocaloric effect with large temperature span in antiperovskite compounds Ga1-xCMn3+x (x=0, 0.06, 0.07, and 0.08)
摘要：
研究了Ga_（1-x）CMn_（3 +x）的磁性和磁热性质。在居里温度TC附近发生可逆磁热效应。磁熵变随x的增大而减小，但TC和磁化强度却增大。与此同时，随x的增加，温度-温度曲线的温度范围变宽.随着x的增大，相对冷却功率（RCP）先增大后减小，这是由于温度跨度的展宽和温度跨度的减小之间的竞争。当x=0.07（TC = 296.5 K）时，观测到的最大RCP（2.1 J/cm ~ 3，低于45 kOe）与当代磁制冷材料相当。考虑到可逆MCE、廉价和无害的原材料，我们的研究结果表明，Ga 1-xCMn 3 +x是一种有希望的室温磁制冷候选材料。
英文摘要：
The magnetic and magnetocaloric properties of Ga1-xCMn3+x have been investigated. Reversible magnetocaloric effect (MCE) occurs near the Curie temperature TC. The magnetic entropy change decreases with increasing x, though TC and magnetization increases. Meanwhile, the temperature span of vs. T plot becomes well broadened with x. Due to the competition between the broadening temperature span and decreasing, the relative cooling power (RCP) increases initially, and then decreases with increasing x. The largest RCP (2.1 J/cm3, under 45 kOe) observed when x=0.07 (TC = 296.5 K) is comparable to the contemporary magnetic refrigerant materials. Considering the reversible MCE, inexpensive and innoxious raw materials, our result suggests that Ga1-xCMn3+x can be promising candidate for magnetic refrigeration around room temperature.
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