超顺磁且类金属的Ru2TiGe：一种大有前景的热电材料
Superparamagnetic and metal-like Ru2TiGe: a propitious thermoelectric material
AI总结：
本研究发现Ru2TiGe合金在低温下呈超顺磁性且电阻率具类金属特性，凭借大的Seebeck系数和低热导率，其ZT值远高于其他纯Heusler合金，在实际热电应用中潜力巨大。
摘要：
我们报告了对Ru基Heusler合金Ru2TiGe的结构、磁性、热容和热电性质的研究。磁性测量表明，在较高温度下，抗磁性和泡利顺磁性贡献主导了磁性行为，而在较低温度下（T<= 20 K），观察到团簇间的超顺磁相互作用。此类磁性缺陷的影响在较低温度下的电阻率行为中也很明显。尽管电阻率的温度依赖性表现出类金属特性，但大的Seebeck系数导致在300 K时具有约1 mW/mK2的可观功率因子。大的功率因子以及低的热导率使得Ru2TiGe在390 K时的ZT值为0.025，比其他纯Heusler合金高出数个数量级，表明其在实际热电应用中具有巨大潜力。
英文摘要：
We report a study of structural, magnetic, heat capacity and thermoelectric properties of a Rubased Heusler alloy, Ru2TiGe. The magnetic measurements reveal that at higher temperatures, diamagnetic and Pauli paramagnetic contributions dominate the magnetic behaviour whereas, at lower temperatures (T<= 20 K), superparamagnetic interaction among clusters is observed. Effect of such magnetic defects is also evident in the electrical resistivity behaviour at lower temperatures. Though the temperature dependence of resistivity exhibits a metal-like nature, the large value of Seebeck coefficient leads to an appreciable power factor of the order of 1 mW/mK2 at 300 K. Large power factor as well as low thermal conductivity results in a value of ZT = 0.025 at 390 K for Ru2TiGe that is orders of magnitude higher than that of the other pure Heusler alloys and point towards its high potential for practical thermoelectric applications.
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