Correlation effects of quantum rotors in Ge crystals


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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/14488

Title:	Correlation effects of quantum rotors in Ge crystals
Authors:	Shima, Hiroyuki¹ Browse this author →KAKEN DB
Authors:	Nakayama, Tsuneyoshi Browse this author
Authors(alt):	島, 弘幸¹
Keywords:	Interstitial oxygen defect
	Germanium crystal
	Quantum rotor
	Two-level systems
Issue Date:	1-Apr-2006
Publisher:	ELSEVIER SCIENCE
Journal Title:	Physica B Condensed Matter
Volume:	376-377
Start Page:	157
End Page:	160
Publisher DOI:	10.1016/j.physb.2005.12.042
Abstract:	We address the accurate treatment of dipolar interaction effects between oxygen defects in Ge crystals on the low-temperature properties of bulk systems. On the basis of a quantum rotor model, we reveal that the interaction between adjacent oxygen defects generates nontrivial low-lying excitations that result in power-law specific heats below 0.1 K. In addition, a peculiar hump is observed for the dielectric susceptibilities at approximately I K. Further, we contend that the predicted power-law specific heats are well described by the two-level tunneling theory, which is based on the random distribution of interacting oxygen defects in Ge samples.
Relation:	http://www.sciencedirect.com/science/journal/09214526
Type:	article (author version)
URI:	http://hdl.handle.net/2115/14488
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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