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Interacting quantum rotors in oxygen-doped germanium

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タイトル: Interacting quantum rotors in oxygen-doped germanium
著者: Shima, Hiroyuki 著作を一覧する
Nakayama, Tsuneyoshi 著作を一覧する
発行日: 2005年 4月29日
出版者: American Physical Society
誌名: Physical Review B
巻: 71
開始ページ: 155210
出版社 DOI: 10.1103/PhysRevB.71.155210
抄録: We investigate the interaction effect between oxygen impurities in crystalline germanium on the basis of a quantum rotor model. The dipolar interaction of nearby oxygen impurities engenders nontrivial low-lying excitations, giving rise to anomalous behaviors for oxygen-doped germanium (Ge:O) below a few degrees Kelvin. In particular, it is theoretically predicted that Ge:O samples with oxygen-concentration of 10(17–18)cm(–3) show (i) power-law specific heats below 0.1 K, and (ii) a peculiar hump in dielectric susceptibilities around 1 K. We present an interpretation for the power-law specific heats, which is based on the picture of local double-well potentials randomly distributed in Ge:O samples.
Rights: Copyright © 2005 American Physical Society
Relation (URI):
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 島 弘幸


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