Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4860994
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Funding
- Major State Basic Research Development Program of China [2011CB922200, 2013CB922300]
- Natural Science Foundation of China [11374097, 61376129, 11074076, 61106122]
- Projects of Science and Technology Commission of Shanghai Municipality [13JC1402100, 13JC1404200]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
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Terahertz reflectance spectra and electrical transport of CuCr1-xMgxO2 films have been studied in temperature range of 150-300 K. With increasing temperature, the phonon mode near 15 THz shows a redshift trend, and free carrier absorption below 6 THz becomes more prominent. Moreover, hole effective mass increases linearly from 0.028 to 0.48 m(0) with the temperature and composition. Hall coefficient shows a turning-point at about 220, 206, and 194K for the composition of x = 0.02, 0.06, and 0.10, respectively. The phenomena can be attributed to the transition of carrier transport mechanism from a thermal activation behavior to a variable range-hopping one. (C) 2014 AIP Publishing LLC.
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