Electronic specific heat measurements for quasicrystals and Frank-Kasper crystals in Mg-Al-Ag, Mg-Al-Cu, Mg-Al-Zn, Mg-Ga-Zn and Al-Li-Cu alloy systems
Electronic specific heat measurements for quasicrystals and Frank-Kasper crystals in Mg-Al-Ag, Mg-Al-Cu, Mg-Al-Zn, Mg-Ga-Zn and Al-Li-Cu alloy systems
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Mg-Al-Ag、Mg-Al-Cu、Mg-Al-Zn、Mg-Ga-Zn 和 Al-Li-Cu 合金体系中准晶体和 Frank-Kasper 晶体的电子比热测量
DOI：
10.1088/0953-8984/3/21/004
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
A. Kamiya
中科院分区：
文献类型：
--
作者：
U. Mizutani;A. Kamiya
测量了电子准晶及相应的Frank-Kasper晶体在镁-铝-银、镁-铝-铜、镁-铝-锌、镁-镓-锌和铝-锂-铜合金系中的电子比热系数。结果表明，在准晶相和Frank-Kasper相中，伽马指数/伽马F与每个原子的平均电子数之比基本上是相同的：它随着每个原子的电子浓度e/a的降低而减小，并在e/a=2.0时外推为零。根据Frank-Kasper相特有的费米面-布里渊区相互作用，讨论了Frank-Kasper相中唯一的e/a依赖关系。从伽马exp/伽马F与e/a的关系来看，准晶相费米面-布里渊区相互作用对于确定准晶相中费米能级的态密度是必不可少的。费米能级附近的电子结构基本上是由局域原子结构决定的，这两个有趣的阶段恰好是相似的。
The electronic specific heat coefficient was measured for sp electron quasicrystals and the corresponding Frank-Kasper crystals in Mg-Al-Ag, Mg-Al-Cu, Mg-Al-Zn, Mg- Ga-Zn and Al-Li-Cu alloy systems. It turned out that the ratio gamma exp/ gamma F plotted against the average number of electrons per atom is essentially identical between the quasicrystalline and Frank-Kasper phases: it decreases with decreasing electron concentration per atom, e/ a, and is extrapolated to zero at about e/a=2.0. A unique e/a dependence of the gamma exp/ gamma F in the Frank-Kasper phase is discussed in terms of the Fermi surface-Brillouin zone interaction specific to this structure. Judging from the identical e/a dependence of gamma exp/ gamma F the authors conclude that a similar Fermi surface-Brillouin zone interaction ought to be essential in determining the density of states at the Fermi level in the quasicrystalline phase. The electronic structure near the Fermi level is essentially determined by the local atomic structure, which happens to be similar between these two intriguing phases.