New Publication.


Sejung Ahn, Yukyung Kim, Youngwoo Nam, Honam Yoo, Jihyun Park, Zhiyong Wang, Zujin Shi, Zhaoxia Jin and Yungwoo Park " Magnetotransport in iodine-doped single-walled carbon nanotubes ", Phys. Rev. B 80, 165426 (2009) [pdf]


Abstract.
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 H2 followed by the H1/2 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.

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http://ntl.snu.ac.kr/439