Magnetotransport in iodine-doped single-walled carbon nanotubes
Ahn, Sejung1; Kim, Yukyung1; Nam, Youngwoo2; Yoo, Honam2; Park, Jihyun2; Park, Yungwoo2; Wang, Zhiyong3; Shi, Zujin3; Jin, Zhaoxia4
Source PublicationPHYSICAL REVIEW B
AbstractMagnetoresistance (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 K < T < 70 K, MR is positive at low magnetic field and becomes negative at higher magnetic field. The negative MR in the high magnetic fields decreases linearly. At T >= similar to 100 K, MR is positive up to 14 T, which could be the result of spin-orbit scattering in the I@SWNT. The MTEP decreases under magnetic field at T < 90 K. The reduction in MTEP is originated from the delocalization of electron wave functions under the magnetic field. At T > 90 K, the thermal fluctuation dominates the effect of magnetic fields resulting the MTEP to be the same as the zero magnetic field TEP.
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WOS IDWOS:000271352100135
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Document Type期刊论文
Corresponding AuthorAhn, Sejung
Affiliation1.Seoul Natl Univ, Interdisciplinary Program Nanosci & Technol, Nano Syst Inst Natl Core Res Ctr, Seoul 151747, South Korea
2.Seoul Natl Univ, Dept Phys & Astron, Nano Syst Inst Natl Core Res Ctr, Seoul 151747, South Korea
3.Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China
4.Renmin Univ China, Dept Chem, Beijing 100872, Peoples R China
Recommended Citation
GB/T 7714
Ahn, Sejung,Kim, Yukyung,Nam, Youngwoo,et al. Magnetotransport in iodine-doped single-walled carbon nanotubes[J]. PHYSICAL REVIEW B,2009,80(16).
APA Ahn, Sejung.,Kim, Yukyung.,Nam, Youngwoo.,Yoo, Honam.,Park, Jihyun.,...&Jin, Zhaoxia.(2009).Magnetotransport in iodine-doped single-walled carbon nanotubes.PHYSICAL REVIEW B,80(16).
MLA Ahn, Sejung,et al."Magnetotransport in iodine-doped single-walled carbon nanotubes".PHYSICAL REVIEW B 80.16(2009).
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