Evidence for the spiky structures in the local density of states of Al-based Quasicrystals

Journal of the Physical Society of Japan 76 巻 3 号 033707-1-033707-4 頁 2007-03 発行
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タイトル ( eng )
Evidence for the spiky structures in the local density of states of Al-based Quasicrystals
作成者
Okada Junpei T.
Yokoyama Yoshihiko
Takasaki Tomoaki
Watanabe Yasuhiro
Nanao Susumu
収録物名
Journal of the Physical Society of Japan
76
3
開始ページ 033707-1
終了ページ 033707-4
抄録
Recent theoretical works have predicted that quasicrystals (QCs) have conspicuous fine electronic structures near the Fermi level (EF); the density of states (DOS) consists of sharp peaks and deep valleys with several lOmeV intervals, which is often called spiky structures. These fine electronic structures are believed to explain the extremely high resistivity of QCs. However, no experiment of observing the fine structures has succeeded for more than ten years. Wehave investigated the DOS around EF on icosahedral (i-)AlCuFe, i-AlPdMn, and decagonal (d-)AlCuCo quasicrystals by break junction tunneling spectroscopy at 4.2K and have observed clear peaks of 3.3 ~ 125mV width near EF. Each peak can be expressed by the probability distribution of the narrow energy gaps that are similar to BCS gaps. This is the first direct experimental result that confirms the predicted spiky structures existing in the vicinity of EF.
著者キーワード
quasicrystals
electronic structure
tunneling spectroscopy
break junction
pseudogap
NDC分類
物理学 [ 420 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
日本物理学会
発行日 2007-03
権利情報
Copyright (c) 2007 The Physical Society of Japan
出版タイプ Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0031-9015
[DOI] 10.1143/JPSJ.76.033707
[NCID] AA00704814
[DOI] http://dx.doi.org/10.1143/JPSJ.76.033707