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標題: Variations of the infrared transmission properties with the metal-insulator transition in thin films of the yttrium-hydride system
作者: Lee, M.W.
Kuo, C.Y.
Lin, H.C.
Wang, H.C.
關鍵字: switchable optical-properties
期刊/報告no:: Journal of Applied Physics, Volume 89, Issue 11, Page(s) 6135-6138.
摘要: This work investigates the variations of the infrared transmission spectra of yttrium-hydride films YHx during the hydrogen loading process for the frequency range 500-4000 cm(-1). The results indicate that the transmittance slightly decreases in the dihydride phase, followed by a significant increase in the trihydride phase. In addition, the carrier concentration decreases, whereas the carrier relaxation time increases with hydrogen content. The hydrogen vibration modes at interstitial sites are completely screened in the dihydride phase. The screening effect decreases as the system goes through the metal-insulator transition. Moreover, the screening effect can be continuously tuned by simply varying the hydrogen content in the yttrium-hydride system. Analysis indicates that the absorption intensity of the vibration mode depends on the carrier concentration. This effect can be used as a diagnostic tool for estimating the carrier concentration and hydrogen content in rare-earth hydrides. (C) 2001 American Institute of Physics.
ISSN: 0021-8979
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