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ID 21544
file
creator
Okada, Junpei T.
Yokoyama, Yoshihiko
Takasaki, Tomoaki
Watanabe, Yasuhiro
Nanao, Susumu
subject
quasicrystals
electronic structure
tunneling spectroscopy
break junction
pseudogap
NDC
Physics
abstract
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.
journal title
Journal of the Physical Society of Japan
volume
Volume 76
issue
Issue 3
start page
033707-1
end page
033707-4
date of issued
2007-03
publisher
日本物理学会
issn
0031-9015
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2007 The Physical Society of Japan
relation url
department
Graduate School of Integrated Arts and Sciences