Electronic transport of the icosahedral Zn-Mg-Sc quasicrystal and its cubic approximant Zn17Sc3
Electronic transport of the icosahedral Zn-Mg-Sc quasicrystal and its cubic approximant Zn17Sc3
复制标题
二十面体 Zn-Mg-Sc 准晶及其立方近似 Zn17Sc3 的电子输运
DOI：
10.1103/physrevb.66.132201
复制
发表时间：
2002
影响因子：
3.7
通讯作者：
S. Takeuchi
中科院分区：
文献类型：
--
作者：
J. Hasegawa;R. Tamura;S. Takeuchi
对新近发现的具有高结构完整性的P型二十面体Zn-Mg-Sc及其近似晶体Zn 17 Sc 3进行了电阻率和比热测量。准晶的电阻率温度系数为负值，ρ 300 K = 330 μΩ cm，而近似晶态的电阻率温度系数为正值，ρ 300 K = 250 μΩ cm。发现两种合金的电子比热系数y很小且几乎相同;准晶和晶体近似物分别为0.55和0.65 mJ/（摩尔K2）。这样小的y值与最近的电子结构计算一致[石井和Fujiwara，J. Alloys.化合物342，343（2002）]，并且可以被认为是P型i相在费米能级处的态密度中存在赝能隙的指示。
The electrical resistivity and specific-heat measurements have been performed for the recently discovered P-type icosahedral Zn-Mg-Sc of high structural perfection and its crystalline approximant Zn 1 7 Sc 3 . The temperature coefficient of the resistivity is found to be negative with ρ 3 0 0 K = 330 μΩ cm for the quasicrystal, while it is positive with ρ 3 0 0 K = 250 μΩ cm for the crystalline approximant. The electronic specific-heat coefficient y is found to be small and nearly the same for both alloys; 0.55 and 0.65 mJ/(mole K 2 ) for the quasicrystal and the crystalline approximant, respectively. Such small y values are consistent with the recent electronic structure calculation [Ishii and Fujiwara, J. Alloys. Compd. 342, 343 (2002)], and can be taken as an indication of the existence of a pseudogap in the density of states at the Fermi level for the P-type i phase.