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arXiv 1603.09003cond-mat.mtrl-sci
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多晶SmB6状态转变的热电信号

Thermoelectric signals of state transition in polycrystalline SmB6

Zengji Yue, Qinjun Chen, Xiaolin Wang

摘要:

近藤拓扑绝缘体SmB 6引起了凝聚态物理界的广泛关注。在SmB 6中观察到了许多独特的电子性质,包括低温电阻率异常、一维电子输运和二维费米面。在这里,我们报告的热电输运性质的多晶SmB 6在一个广泛的温度从300 K到2 K。在12 K附近观察到了Seebeck系数S随温度变化的反常转变,从S(T)~ T-1转变为S(T)~ T。这种转变表明导电性从3D金属体态到具有绝缘体态的2D金属表面态的转变。我们的研究结果表明,热输运测量可以用来表征拓扑绝缘体的状态转变。

英文摘要:

Topological Kondo insulator SmB6 has attracted quite a lot of attentions from condensed matter physics community. A number of unique electronic properties, including low- temperature resistivity anomaly, 1D electronic transport and 2D Fermi surfaces have been observed in SmB6. Here, we report on thermoelectric transport properties of polycrystalline SmB6 over a broad temperature from 300 K to 2 K. An anomalous transition in the temperature-dependent Seebeck coefficient S from S(T) ~ T-1 to S(T) ~ T was observed around 12 K. Such a transition demonstrates a transition of conductivity from 3D metallic bulk states to 2D metallic surface states with insulating bulk states. Our results suggest that the thermotransport measurements could be used for the characterization of state transition in topological insulators.

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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