Interacting quantum rotors in oxygen-doped germanium


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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/6055

Title:	Interacting quantum rotors in oxygen-doped germanium
Authors:	Shima, Hiroyuki¹ Browse this author →KAKEN DB
Authors:	Nakayama, Tsuneyoshi Browse this author
Authors(alt):	島, 弘幸¹
Issue Date:	29-Apr-2005
Publisher:	American Physical Society
Journal Title:	Physical Review B
Volume:	71
Start Page:	155210
Publisher DOI:	10.1103/PhysRevB.71.155210
Abstract:	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:	http://www.aps.org/
Type:	article
URI:	http://hdl.handle.net/2115/6055
Appears in Collections:	工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 島弘幸

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