Temperature dependence of the thermopower and its variation of the Au atomic contact
Temperature dependence of the thermopower and its variation of the Au atomic contact
复制标题
热电势的温度依赖性及其 Au 原子接触的变化
DOI：
10.1088/0957-4484/26/4/045709
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发表时间：
2015
期刊：
影响因子：
3.5
通讯作者：
Manabu Kiguchi
中科院分区：
文献类型：
--
作者：
Ryuji Matsushita;Satoshi Kaneko;Shintaro Fujii;Hisao Nakamura;Manabu Kiguchi
我们进行了同时测量的热电势，和电导的Au原子接触过程中的温度控制下的自断裂过程。在整个测量温度范围内（290-330 K），热电势随机地从正到负波动，平均热电势相对于接触热电势的变化可以忽略不计。同时，热电电压的标准偏差随接触温差线性增加。高于320 K，我们观察到的热电势，这表明在接触附近的缺陷的密度减少的标准偏差的减少。的热电电压的标准偏差的线性增加，并在320 K以上的热电势的标准偏差的减少，表明热电势的标准偏差提供洞察到一个单独的Au原子接触的热电势和Au原子接触的原子结构，如结晶度和接触附近的缺陷的分布。
We performed simultaneous measurements of the thermopower, and conductance of Au atomic contacts during the self-breaking process under temperature control. During the whole measurement temperature regime (290–330 K), the thermopower randomly fluctuated from positive to negative in sign, and the average thermopower was negligibly small with respect to the variation of the thermopower of the contact. Meanwhile, the standard deviation of the thermoelectric voltage increased linearly with the temperature difference across the contacts. Above 320 K, we observed a decrease in the standard deviation of thermopower, which suggested a decrease in the density of defects near the contacts. The linear increase in the standard deviation of the thermoelectric voltage, and the decrease in the standard deviation of the thermopower above 320 K, indicate that the standard deviation of thermopower provides insight into the thermopower of an individual Au atomic contact and the atomic structure of Au atomic contacts, such as crystallinity and the distribution of defects near the contacts.