Study for room-temperature centimeter-sized ballistic transport alloys

在223 K以下的低温区，具有Ni中心二十面体Ni_5Zr_5Nb_3团簇的Ni-Nb-Zr-H非晶合金表现出厘米级的弹道输运行为，比Ag的大4倍，这与非晶化程度的增加有关。在22-25 K温度范围内，施加-8GPa的压力虽不能提高非晶合金的电导率，但电导率的符号由负变为正。团簇间的电子隧穿机制可以排除。

Ni-Nb-Zr-H glassy alloys with Ni-centered icosahedral Ni_5Zr_5Nb_3 clusters showed centimeter-sized ballistic transport behaviors of 4-fold larger than that of Ag, in low temperature regions up to 223 K, according to increase in degree of amorphousness. Although application of pressure of -8 GPa did not enhance conductivity of the glassy alloys, but changed its sign from negative to positive at 22-25 K. The transport mechanism could be excluded by tunneling of one electron among clusters.