Electrical Transport and Optical Properties of Hydrogen-Deficient YH2 Films
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概要
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We have investigated electron transport characteristics of a hydrogen-deficient dihydride of yttrium YH2+δ ($-0.3<\delta<0.05$) focusing particularly on the effect of hydrogen deficiency on carrier relaxation time. At room- and low-temperatures, dc-specific resistivities obtained from electrical measurements show minimum values when hydrogen-deficient quantity $\delta$ is approximately $-0.1$. Optical conductivities were obtained from reflectance measurements by the Kramers–Knonig transformation. When $\delta$ is changed, the carrier scattering rate determined from the optical conductivity shows a behavior similar to those of dc resistivities. Not only the carrier scattering rate but also a band-gap energy $E_{0}$ associated with a $\Gamma'_{2}$–$\Gamma'_{25}$ transition is influenced by the hydrogen deficiency; $E_{0}$ shows a maximum value as $\delta$ is about $-0.1$. Hall coefficients are found to be positive but fairly small (${\sim}10^{-11}$ m3/C), indicating that electrons as well as holes presumably contribute to electric conduction in YH2+δ.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-02-15
著者
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Takanashi Koki
Institute For Materials Research (imr) Tohoku University
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Sakai Masamichi
Faculty Of Engineering Saitama University
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NAKAMURA Osamu
Advanced Research Laboratory., Casio Computer Co., Ltd.
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TAKEYAMA Keishi
Advanced Research Laboratory., Casio Computer Co., Ltd.
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Uwatoko Yoshiya
Institute For Solid State Physics (issp) The University Of Tokyo
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Kontani Toru
Faculty Of Engineering Saitama University
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Obi Yoshihisa
Institute For Materials Research
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Nakamura Osamu
Advanced Research Laboratory., Casio Computer Co., Ltd., Imai 3-chome, Ome 198-8555, Japan
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Sakai Masamichi
Faculty of Engineering, Saitama University, Sakura-ku, Shimo-Okubo, Saitama 338-8570, Japan
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Uwatoko Yoshiya
Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa 277-8581, Japan
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Takanashi Koki
Institute for Material Research, Tohoku University
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Takeyama Keishi
Advanced Research Laboratory., Casio Computer Co., Ltd., Imai 3-chome, Ome 198-8555, Japan
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Takanashi Koki
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Obi Yoshihisa
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Kontani Toru
Faculty of Engineering, Saitama University, Sakura-ku, Shimo-Okubo, Saitama 338-8570, Japan
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Uwatoko Yoshiya
Institute for Solid State Physics
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