Metal-insulator transition in the spinel-type Cu(Ir1-xVx)2S4

doi:info:doi/10.1016/j.physb.2006.04.006

Metal-insulator transition in the spinel-type Cu(Ir1-xVx)2S4 利用統計を見る

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アイテムタイプ	学術雑誌論文 / Journal Article.
言語	英語
キーワード	spinel-type CuIr2S4, CuV2S4, Cu(Ir1-xVx)2S4, metal-insulator transition, electrical conductivity, magnetic properties
著者	NAGATA Shoichi ( 研究者リゾルバーID: 1000080155936 ) KAWASHIMA Y. HORIBE N. AWAKA J. YAMAMOTO H. EBISU Shuji ( 研究者リゾルバーID: 1000010250523 )
著者（別表記）	永田正一 KAWASHIMA Y. HORIBE N. AWAKA J. YAMAMOTO H. 戎修二
室蘭工業大学研究者データベースへのリンク	戎修二（EBISU Shuji）
抄録	The spinel CuIr2S4 exhibits a temperature-induced metal-insulator (M-I) transition at around TM-I=226K with a structural transformation, at which a simultaneous bond dimerization with spin-singlet state and charge-ordering transition takes place. Conversely, CuV2S4 exhibits two-step anomalies at about 92 and 56K, reflecting the CDW state. High-purity spinel-type Cu(Ir1-xVx)2S4 specimens have been synthesized. The lattice constant does not obey Vegard's law, but looks like a parabolic curve. The d electrons on the octahedral B sites play a dominant role in determining the physical properties. A low substitution (x≈0.04) of V for Ir leads to disappearance of the step-like sharp M-I transition, and vice versa, a low substitution of Ir for V destroys the CDW transition. The local structural and orbital degrees of freedom in Cu(Ir1-xVx)2S4 couple to the spin system and the electronic state. The M-I transition and the CDW state are incompatible with each other in Cu(Ir1-xVx)2S4. In the metallic phase, a novel relationship, namely "a mirror image effect" has been manifestly found between the residual resistivity and the electronic energy density-of-states D(&epsi;F) at the Fermi level. The lower the resistivity, the higher the value of D(&epsi;F). Furthermore, a composition-induced gradual M-I transition is found over the range of 0.00&les;x&les;1.00, where the most insulating behavior is displayed around x≈0.2-0.3.
雑誌名	Physica. B, Condensed matter
巻	387
号	1-2
ページ	208 - 216
発行年	2007-01-01
出版者	Elsevier B.V.
出版者版へのリンク	10.1016/j.physb.2006.04.006
DOI	info:doi/10.1016/j.physb.2006.04.006
論文ID（NAID）	http://ci.nii.ac.jp/naid/120000802136
日本十進分類法	428.4
ISSN	09214526
書誌レコードID	AA10673546 AA11536700
参考URL	http://www.elsevier.com/locate/issn/09214526
著者版フラグ	author
フォーマット	application/pdf

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