Anomalous Transport Behavior of a Binary Cd-Yb Icosahedral Quasicrystal
Anomalous Transport Behavior of a Binary Cd-Yb Icosahedral Quasicrystal
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二元 Cd-Yb 二十面体准晶的反常输运行为
DOI：
10.1143/jjap.40.l912
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发表时间：
2001
影响因子：
1.5
通讯作者：
A. Tsai
中科院分区：
文献类型：
--
作者：
R. Tamura;Y. Murao;S. Takeuchi;K. Tokiwa;Tsuneo Watanabe;Taku J. Sato;A. Tsai
人们发现，最近发现的二元 Cd-Yb 二十面体 (i) 相的电子特性与迄今为止研究的三元 i 相的电子特性显着不同：电阻率随着温度降低至 10 K 左右而迅速下降（根据成分下降 10-80%），并在 10 K 以下趋于稳定。在低温下观察到在 9 T 时巨磁阻高达 200%。电子比热系数γ非常大，为2.87 mJ/(moleK2)，德拜温度θD低至140 K，这与三元i相中观察到的趋势形成鲜明对比。这些异常特征表明，对于当前的二元 i 相，必须考虑与三元 i 相所提出的传输机制不同的传输机制。
Electronic properties of the recently discovered binary Cd-Yb icosahedral(i) phase have been found to be strikingly different from those of ternary i-phases studied so far: The resistivity decreases rapidly (by 10–80% depending on the composition) with decreasing temperature down to about 10 K and levels off below 10 K. A giant magnetoresistance reaching as high as 200% at 9 T is observed at low temperatures. The electronic specific heat coefficient γ is very large, i.e., 2.87 mJ/(moleK2), and the Debye temperature ΘD is as low as 140 K, which are in striking contrast with the trend observed in ternary i-phases. These anomalous features indicate that a different transport mechanism other than those proposed for ternary i-phases has to be considered for the present binary i-phase.