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

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概要

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• 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.

• 社団法人日本物理学会の論文
• 2007-03-15

著者

• YOKOYAMA Y.

  Institute for Materials Research, Tohoku University

• Ekino T

  Graduate School Of Integrated Arts And Sciences Hiroshima University : Department Of Quantum Matter

• Nanao Susumu

  Institute Of Industrial Science The University Of Tokyo

• Yokoyama Y

  Institute For Materials Research Tohoku University

• Watanabe Y

  Institute For Materials Research Tohoku University

• Okada J

  Department Of Biology Graduate School Of Science Kyushu University

• Takasaki T

  Department Of Physics Science University Of Tokyo

• Okada J.

  Department of Obstetrics and Gynecology, Nagoya City University Graduate School of Medicine

• Nanao S

  Institute Of Industrial Science The University Of Tokyo

• Takasaki T

  Department Of Quantum Matter Graduate School Of Advanced Sciences Of Matter Hiroshima University

• Ekino T

  Graduate School Of Advanced Sciences Of Matter Hiroshima University:faculty Of Integrated Arts And S

• Watanabe Yasuhiro

  Institute for Materials Research, Tohoku University

• Ekino T.

  Graduate School of Integrated Arts and Sciences, Hiroshima University

• Takasaki Tomoaki

  Department of Quantum Matter, Graduate School of Advanced Sciences of Matter, Hiroshima University

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