Logarithmic temperature dependence of Hall transport in granular metals
Logarithmic temperature dependence of Hall transport in granular metals
复制标题
粒状金属中霍尔传输的对数温度依赖性
DOI:
10.1103/physrevb.84.052202
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发表时间:
2011-07
影响因子:
3.7
通讯作者:
Lin Juhn-Jong
中科院分区:
文献类型:
--
作者:
Zhang Yu-Jie;Li Zhi-Qing;Lin Juhn-Jong
We have measured the Hall coefficient $R_H$ and the electrical conductivity $\sigma$ of a series of ultrathin indium tin oxide films between 2 and 300 K. A robust $R_H$\,$\propto$\,ln$T$ law is observed in a considerably wide temperature range of 2 and $\sim$120 K. This ln$T$ dependence is explained as originated from the electron-electron interaction effect in the presence of granularity, as newly theoretically predicted. Furthermore, we observed a $\sigma$\,$\propto$\,ln$T$ law from 3 K up to several tens K, which also arose from the Coulomb interaction effect in inhomogeneous systems. These results provide strong experimental supports for the current theoretical concepts for charge transport in granular metals with intergrain tunneling conductivity $g_T$$\gg$1.
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