Correlation effects of quantum rotors in Ge crystals

Shima, Hiroyuki; Nakayama, Tsuneyoshi

Physica B Condensed Matter, 2006, 376-377, 157-160

Permalink : https://hdl.handle.net/2115/14488

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アクセス権	open access
URI	https://hdl.handle.net/2115/14488
タイトル	Correlation effects of quantum rotors in Ge crystals
著者	e-Rad_Researcher 40312392 著者名 Shima, Hiroyuki 島, 弘幸
著者	著者名 Nakayama, Tsuneyoshi
言語	英語
キーワード	Interstitial oxygen defect
	Germanium crystal
	Quantum rotor
	Two-level systems
発行日	2006-04-01
出版者	ELSEVIER SCIENCE
収録物名	Physica B Condensed Matter
巻(号)	376-377
ページ	157-160
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0921-4526
EISSN	0921-4526
関連情報	URI http://www.sciencedirect.com/science/journal/09214526
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.physb.2005.12.042