Low-energy charge dynamics in La0.7Ca0.3MnO3: THz time-domain spectroscopic studies

作     者：N. Kida M. Hangyo M. Tonouchi 

作者机构：Core Research for Evolutional Science & Technology (CREST) Japan Science & Technology Corporation (JST) 2-1 Yamadaoka Suita Osaka 565-0871 Japan 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：2000年第62卷第18期

页      面：R11965(R)-R11965(R)页

核心收录：

摘      要：Direct experimental estimations of the low-energy (1.5–10 meV) complex dielectric constants spectrum and its temperature variation have been investigated for La0.7Ca0.3MnO3 thin films using terahertz time-domain spectroscopy. At low temperatures, a clear Drude term emerges. With increasing temperature, the scattering rate increases, while the plasma frequency decreases, both derived from a simple Drude model. Finally, a Drude term submerges well below the insulator-metal transition temperature. On the basis of the present results, low-energy charge dynamics are discussed.