Abstract-Electrical transport properties of (La,Pr,Ca)MnO3 nanowires investigated using terahertz time domain spectroscopy

T. V. A. Nguyen1,a), A. N. Hattori1,2, M. Nagai3, T. Nakamura1, M. Ashida3 and H. Tanaka1,b)
a) Current affiliation: Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, Japan
b) Author to whom correspondence should be addressed. Electronic mail: h-tanaka@sanken.osaka-u.ac.jp
J. Appl. Phys. 119, 125102 (2016); 
http://dx.doi.org/10.1063/1.4944601

The electrical transport properties of a 100-nm-width (La,Pr,Ca)MnO3nanowire sample were investigated using terahertz (THz) time domain spectroscopy. When the electric field of incident THz pulses was parallel to the nanowires, we obtained their intrinsic THz conductivity. The temperature-dependent dcconductivity and metallic fraction were simultaneously estimated by analyzing the THz conductivity using a metal-insulatorcomposite model. The evaluated dc conductivity closely reproduced that measured by electrical probe measurement. The metallic fraction showed the evolution of electric domains from the metallic state at temperatures below 100 K to the insulating state at temperatures above 150 K through a coexistence region, which was in consistence with the phase-separated scenario.