零磁场和外加磁场中热电功率测量的实验装置
Experimental Setup for the Measurement of the Thermoelectric Power in Zero and Applied Magnetic Field
摘要：
开发了一种用于测量温度范围从2到350 K和磁场高达140 kOe的热电功率（TEP，塞贝克系数）的实验装置。该系统是为适应商业低温恒温器而设计的，具有多功能、准确和自动化的特点;使用两个加热器和两个温度计提高了TEP测量的准确性。在16小时内可获得2 ~ 350 K温度扫描的高密度数据，在2小时内可获得0 ~ 140 kOe等温场扫描的高密度数据。在铂丝和Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8+δ}$高$T_{c}$超导体上对系统进行了标定。磷青铜（电压引线）的TEP很小，在80 K以下，其TEP绝对值远小于0.5 $μ$ V/K。以铜、铂丝为例，以磷青铜丝为例，测量结果与文献值吻合较好。为了证明所施加的磁场响应的系统，我们报告测量的TEP单晶样品的LaAgSb $_{2}$和CeAgSb $_{2}$在外地高达140千欧。
英文摘要：
An experimental setup was developed for the measurement of the thermoelectric power (TEP, Seebeck coefficient) in the temperature range from 2 to 350 K and magnetic fields up to 140 kOe. The system was built to fit in a commercial cryostat and is versatile, accurate and automated; using two heaters and two thermometers increases the accuracy of the TEP measurement. High density data of temperature sweeps from 2 to 350 K can be acquired in under 16 hours and high density data of isothermal field sweeps from 0 to 140 kOe can be obtained in under 2 hours. Calibrations for the system have been performed on a platinum wire and Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+δ}$ high $T_{c}$ superconductors. The measured TEP of phosphor-bronze (voltage lead wire) turns to be very small, where the absolute TEP value of phosphor-bronze wire is much less than 0.5 $μ$V/K below 80 K. For copper and platinum wires measured against to the phosphor-bronze wire, the agreement between measured results and the literature data is good. To demonstrate the applied magnetic field response of the system, we report measurements of the TEP on single crystal samples of LaAgSb$_{2}$ and CeAgSb$_{2}$ in fields up to 140 kOe.
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