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首页> 外文期刊>Applied Physics Letters >A low-temperature study of manganese-induced ferromagnetism and valence band convergence in tin telluride
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A low-temperature study of manganese-induced ferromagnetism and valence band convergence in tin telluride

机译：碲化锡中锰诱导的铁磁性和价带收敛的低温研究

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摘要

SnTe is renowned for its promise in advancing energy-related technologies based on thermoelectricity and for its topological crystalline insulator character. Here, we demonstrate that each Mn atom introduces ～4 μ_B (Bohr magneton) of magnetic moment to Sn_(1-x)Mn_xTe. The Curie temperature T_C reaches ～14 K for x= 0.12, as observed in the field dependent hysteresis of magnetization and the anomalous Hall effect. In accordance with a modified two-band electronic Kane model, the light L-valence-band and the heavy ∑-valence-band gradually converge in energy with increasing Mn concentration, leading to a decreasing ordinary Hall coefficient R_H and a favorably enhanced Seebeck coefficient S at the same time. With the thermal conductivity k lowered chiefly via point defects associated with the incorporation of Mn, the strategy of Mn doping also bodes well for efficient thermoelectric applications at elevated temperatures.
机译：SnTe因其在基于热电的能源相关技术方面的发展前景以及其拓扑晶体绝缘体的特性而闻名。在这里，我们证明每个Mn原子向Sn_（1-x）Mn_xTe引入约4μ_B（玻尔磁子）的磁矩。从磁场相关的磁滞和异常霍尔效应可以看出，居里温度T_C在x = 0.12时达到〜14K。根据改进的两波段电子凯恩模型，轻的L价带和重的Σ价带随着Mn浓度的增加而逐渐收敛，从而导致普通霍尔系数R_H减小，塞贝克系数提高。 S在同一时间。由于主要通过与掺入锰有关的点缺陷来降低热导率k，因此锰掺杂的策略对于高温下的有效热电应用也是一个很好的预兆。

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  • 来源
    《Applied Physics Letters》 |2016年第18期|182101.1-182101.5|共5页
  • 作者

    Hang Chi; Gangjian Tan; Mercouri G. Kanatzidis; Qiang Li; Ctirad Uher;

  • 作者单位

    Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA ,Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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