Electronic structure and electron transport of Ca-Mg-Al metallic glasses
Electronic structure and electron transport of Ca-Mg-Al metallic glasses
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Ca-Mg-Al金属玻璃的电子结构和电子传输
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
T. Matsuda
中科院分区：
文献类型：
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作者：
U. Mizutani;M. Sasaura;Y. Yamada;T. Matsuda
对Ca0.7Mg0.3-xAlx和Ca0.6Mg0.4-xAlx两系列金属玻璃的12个样品在1.5 ~ 6 K和2 ~ 300 K温度范围内的低温比热和电阻率进行了测量。在77 ~ 300 K范围内测量了所有Ca0.7Mg0.3-xAlx金属玻璃的霍尔系数。从电子比热系数的组分依赖性推导出自由电子行为的实质性偏离。当Mg被Al取代时，电阻率在50到400 mu ω cm之间变化很大。电阻率在低电阻率区（rho <150 mu ω cm）的温度依赖性可以用广义的Faber-Ziman理论来解释。发现在高电阻率区（200-400 μ ω cm）的电子输运仍然强烈依赖于成分和温度。作者认为，这些独特的特征远远超出了广义费伯-齐曼理论的范围。
Low-temperature specific heats and electrical resistivities were measured on 12 samples in two series of Ca0.7Mg0.3-xAlx and Ca0.6Mg0.4-xAlx metallic glasses over the temperature ranges 1.5-6 and 2-300 K respectively. The Hall coefficient was also measured for all Ca0.7Mg0.3-xAlx metallic glasses in the range 77-300 K. A substantial departure from the free electron behaviour is deduced from the composition dependence of the electronic specific heat coefficient. The electrical resistivity is found to vary widely from 50 to 400 mu Omega cm as Mg is replaced by Al. The temperature dependence of resistivity in the low resistivity regime ( rho <150 mu Omega cm) can be explained in the generalized Faber-Ziman theory. The electron transport in the high-resistivity regime (200-400 mu Omega cm) is found to be still strongly composition- and temperature-dependent. These unique features are, the authors believe, far beyond the scope of the generalised Faber-Ziman theory.