Negative magnetoresistance in undoped semiconducting amorphous carbon films

作者：Sagar Rizwan Ur Rehman; Zhang Xiaozhong^*; Wang Jimin; Xiong Chengyue

来源：Journal of Applied Physics, 2014, 115(12): 123708.

DOI：10.1063/1.4869780

Amorphous carbon (a-C) films were fabricated by chemical vapor deposition on SiO2 substrate. The a-C films have nano-crystalline sp(2) structure with the grain size of similar to 5 nm and an optical band gap of similar to 1.8 eV. The a-C films show negative magnetoresistance (MR) from 300 to 2K and an anomalous shape change of MR-magnetic field curves at 10 K. Grain boundary scattering theory and weak localization theory were used to explain the MR mechanism and shape change of MR-magnetic field curves.

• 出版日期2014-3-28
• 单位清华大学