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首页> 外文期刊>Physical review >Tuning of magnetic and transport properties in Bi_2Te_3 by divalent Fe doping
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Tuning of magnetic and transport properties in Bi_2Te_3 by divalent Fe doping

机译：二价铁掺杂对Bi_2Te_3磁性和输运性质的调控

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摘要

We report the doping effect of a magnetic Fe ion in Bi_2Te_3, that is, Bi_(2-x)Fe_xTe_3 (x = 0, 0.08, 0.15, 0.2, 0.25, and 0.3). The paramagnetic magnetization data reveal that the Fe ions are doped in the divalent form. The Fe~(2+) state substituted for Bi~(3+) can create hole donors, which compensate for the electron dopants of Bi_2Te_3 with a small amount of Te excess. This causes the n-type carrier density to be decreased with increasing x, and finally be changed to p type at x = 0.3, where the carrier mobility suddenly drops and the electrical resistivity abruptly increases. These results are consistent with angle-resolved photoemission spectroscopy experiments. The Fermi level shifts downward with increasing x. Furthermore, we find a larger spin polarization for the Fe-doped Bi_2Te_3 samples, which is crucial for future spintronics applications.
机译：我们报告了Bi_2Te_3中的磁性Fe离子的掺杂效应，即Bi_（2-x）Fe_xTe_3（x = 0、0.08、0.15、0.2、0.25和0.3）。顺磁磁化数据表明，Fe离子以二价形式掺杂。取代Bi〜（3+）的Fe〜（2+）态可以产生空穴供体，以少量的Te过量补偿Bi_2Te_3的电子掺杂。这导致n型载流子密度随着x的增加而降低，并最终在x = 0.3时变为p型，此时载流子迁移率突然下降，电阻率突然增加。这些结果与角度分辨光发射光谱实验一致。费米能级随着x的增加而向下移动。此外，我们发现掺铁的Bi_2Te_3样品具有更大的自旋极化，这对于未来自旋电子学的应用至关重要。

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  • 来源
    《Physical review》 |2013年第20期|201105.1-201105.5|共5页
  • 作者

    N. H. Jo; K. J. Lee; C. M. Kim; K. Okamoto; A. Kimura; K. Miyamoto; T. Okuda; Y. K. Kim; Z. Lee; T. Onimaru; T. Takabatake; M. H. Jung;

  • 作者单位

    Department of Physics, Sogang University, Seoul 121-742, Republic of Korea;

    Department of Physics, Sogang University, Seoul 121-742, Republic of Korea;

    Department of Physics, Sogang University, Seoul 121-742, Republic of Korea;

    Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan;

    Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan;

    Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan;

    Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan;

    School of Mechanical & Advanced Materials Engineering, UNIST, Ulsan 689-798, Republic of Korea;

    School of Mechanical & Advanced Materials Engineering, UNIST, Ulsan 689-798, Republic of Korea;

    Department of Quantum Matter, ADSM, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan;

    Department of Quantum Matter, ADSM, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan;

    Department of Physics, Sogang University, Seoul 121-742, Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    diamagnetism, paramagnetism, and superparamagnetism; magnetic impurity interactions; electronic conduction in metals and alloys; other topics in electronic structure (restricted to new topics in section 71);

    机译：抗磁性;顺磁性和超顺磁性;磁性杂质相互作用;金属和合金中的电子传导;电子结构中的其他主题（仅限于第71节中的新主题）;

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