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タイトル: Surface Peierls transition on Cu(001) covered with heavier p-block metals
著者: Aruga, Tetsuya  kyouindb  KAKEN_id
著者名の別形: 有賀, 哲也
キーワード: Peierls transition
Charge density wave
発行日: Aug-2006
出版者: Elsevier
引用: Tetsuya Aruga, "Surface Peierls transition on Cu(001) covered with heavier p-block metals", Surface Science Reports, 61-6, (2006), 283-302.
誌名: Surface Science Reports
巻: 61
号: 6
開始ページ: 283
終了ページ: 302
抄録: The Cu(001) surface covered with submonolayer coverages of In and Sn undergoes phase transitions at around 350–400 K. The transition is associated with the surface electronic structure change between low-temperature gapped and high-temperature ungapped ones. The energy gap positions in the k space coincide with the surface Brillouin zone boundaries of the low-temperature phases. These observations imply that the phase transitions are classified into the Peierls-type charge density wave (CDW) phase transition. The CDW ground states are characterized by large overall CDW gaps and long CDW correlation lengths. Structural studies show that the transitions are associated with order–disorder processes. This suggests that these are in the strong-coupling regime. However, the associated gapped–ungapped change suggests that the electronic terms play a significant role, in contradiction with the strong-coupling scenario. Based on the results of recent works on the precise temperature dependence of the CDW gap and critical X-ray scattering, the origin of this dual nature and the detailed mechanism of the phase transition is discussed. It is suggested that the electronic entropy of the CDW ground state is not governed by the overall energy gap but by the gap between the upper band minimum and the Fermi level of the whole system. The dual nature of the surface Peierls transition on Cu(001) originates, on the one hand, from the existence at metal surfaces of the two characteristic energy gaps: the overall gap, which determines the CDW stabilization energy, and the upper gap, which governs the electronic entropy. On the other hand, the CDW correlation length is suggested to play another significant role in determining the nature of the Peierls transition. The classification of the Peierls transitions according to the CDW correlation length and the gap size is discussed. It is suggested that the surface Peierls transition on Cu(001) covered with heavier p-block metallic elements is qualitatively different from both the weak-coupling CDW transition, with long CDW correlation length and small gaps, and the strong-coupling CDW transitions, with short correlation lengths and large gaps, and should be classified into the third class, which is characterized by long coherence and strong coupling.
著作権等: Copyright © 2006 Elsevier B.V. All rights reserved.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/68518
DOI(出版社版): 10.1016/j.surfrep.2006.04.002
出現コレクション:学術雑誌掲載論文等

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