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arXiv 1704.03029cond-mat.mtrl-sci
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碲化铋单晶声子热导率和洛伦兹比的实验测定

Experimental determination of phonon thermal conductivity and Lorenz ratio of single crystal bismuth telluride

Mengliang Yao, Stephen Wilson, Mona Zebarjadi, Cyril Opeil

摘要:

用磁热电阻法测量了Bi $_2$ Te $_3$单晶在5 ~ 60 K的晶格热导率。在测量热导率和电阻率时,我们施加一个大的横向磁场来抑制电子热传导。然后通过将热导率对电导率曲线外推至零电导率值来计算晶格热导率。结果表明,在中温区,声子热导率服从$e^{(Δ_{min}/T)}$温度关系,Lorenz比对应于修正的Sommerfeld值.我们对Bi $_2$ Te $_3$的低温实验数据和分析是对Goldsmid [14]先前测量和Broido $\textit{et al.}$ [21]在100 - 300 K高温下的理论计算的重要补充。

英文摘要:

We use a magnetothermal resistance method to measure the lattice thermal conductivity of a single crystal of Bi$_2$Te$_3$ from 5 to 60 K. We apply a large transverse magnetic field to suppress the electronic thermal conduction while measuring thermal conductivity and electrical resistivity. The lattice thermal conductivity is then calculated by extrapolating the thermal conductivity versus electrical conductivity curve to a zero electrical conductivity value. Our results show that the measured phonon thermal conductivity follows the $e^{(Δ_{min}/T)}$ temperature dependence and the Lorenz ratio corresponds to the modified Sommerfeld value in the intermediate temperature range. Our low-temperature experimental data and analysis on Bi$_2$Te$_3$ are an important compliment to previous measurements of Goldsmid [14] and theoretical calculations by Broido $\textit{et al.}$ [21] at higher temperature 100 - 300 K.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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