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Magnetotransport in iodine-doped single-walled carbon nanotubes

机译：碘掺杂单壁碳纳米管中的磁传输

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摘要

Magnetoresistance (MR) and magnetothermoelectric power (MTEP) of iodine-doped single-walled carbon nanotubes (I@SWNT) under magnetic fields up to 14 T are investigated from room temperature (300 K) down to 1.6 K. Our results on resistivity and thermoelectricpower (TEP) in a zero magnetic field are similar to those reported by Grigorian et al. [Phys. Rev. Lett. 80, 5560 (1998)] The positive sign of the TEP values indicates that the majority of the carriers in the I@SWNT are holes. The broad enhancement of TEP at temperatures of 30-200 K shows quasilinear temperature dependence and is consistent with sharply varying density of states near the Fermi level with additional contribution from the spin-orbit scattering in the normal metallic characteristics of the I@SWNT. For T<7 K, MR is negative and it decreases with H~2 followed by the H~(1/2) dependence at around H=2 T which is characteristic for the weak localization. In the range 7 K90 K, the thermal fluctuation dominates the effect of magnetic fields resulting the MTEP to be the same as the zero magnetic field TEP.
机译：从室温（300 K）至1.6 K，研究了碘掺杂单壁碳纳米管（I @ SWNT）在高达14 T的磁场下的磁阻（MR）和磁热功率（MTEP）。零磁场中的热电功率（TEP）与Grigorian等人报道的相似。 [物理牧师80，5560（1998）] TEP值的正号表示I @ SWNT中的大多数载流子是空穴。在30-200 K的温度下TEP的广泛增强显示出准线性温度依赖性，并且与费米能级附近的态密度急剧变化相一致，并且自旋轨道散射对I @ SWNT的正常金属特性产生了额外的贡献。对于T <7 K，MR为负，并且随着H〜2的减小而减小，然后在H = 2 T附近呈H〜（1/2）依赖性，这是弱定位的特征。在7 K 90 K时，热波动主导了磁场的影响，导致MTEP与零磁场TEP相同。

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  • 来源
    《Physical review》 |2009年第16期|1080-1085|共6页
  • 作者

    Sejung Ahn; Yukyung Kim; Youngwoo Nam; Honam Yoo; Jihyun Park; Yungwoo Park; Zhiyong Wang; Zujin Shi; Zhaoxia Jin;

  • 作者单位

    Interdisciplinary Program in Nano-Science and Technology, Nano Systems Institute-National Core Research Center, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747, Korea;

    Interdisciplinary Program in Nano-Science and Technology, Nano Systems Institute-National Core Research Center, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747, Korea;

    Department of Physics and Astronomy, Nano Systems Institute-National Core Research Center, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747, Korea;

    Department of Physics and Astronomy, Nano Systems Institute-National Core Research Center, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747, Korea;

    Department of Physics and Astronomy, Nano Systems Institute-National Core Research Center, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747, Korea;

    Department of Physics and Astronomy, Nano Systems Institute-National Core Research Center, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747, Korea;

    Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China;

    Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China;

    Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    magnetoresistance; thermoelectric and thermomagnetic effects; localization effects (anderson or weak localization);

    机译：磁阻热电和热磁效应;本地化影响（安德森或弱本地化）;

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