1.School of Electronic & Information Engineering， Shanghai University of Electric Power， Shanghai 200082， China;2.Department of Physics， Shanghai University， Shanghai 200444， China;3.State Key Laboratory of Infrared Physics， Shanghai Institute of Technical Physics， Chinese Academy of Sciences， Shanghai 200083， China
Supported by National Natural Science Foundation of China (11674213, 61735010, 11647023, 61625505), Natural Science Foundation of Shanghai (17ZR1411500)
The thermodynamics of La0.7Ca0.3MnO3 film by terahertz transient spectroscopy were presented. The temperature of metal-insulator phase transition of La0.7Ca0.3MnO3 film is observed to occur around 260 K， which is almost the same as that of the ferromagnetic-paramagnetic phase transition. It indicates that the conductivity of the La0.7Ca0.3MnO3 film is closely related to the order of magnetic moments in the film. We find the conductivity of the La0.7Ca0.3MnO3 film can be reproduced with Drude model at low temperature range from 40 K to 200 K， and Drude-Lorentz model at high temperature region from 210 K to 290 K.
LI Gao-Fang, XU Yan-Xia, LIU Xian-Kuan, MA Guo-Hong, GAO Yan-Qing, CUI Hao-Yang, HUANG Zhi-Ming, CHU Jun-Hao. The temperature-dependent phase transition in La0.7Ca0.3MnO3 film probed with terahertz transient spectroscopy[J]. Journal of Infrared and Millimeter Waves,2021,40(4):490~495Copy