Electronic structure and superconducting gap of silicon clathrate Ba8Si46 studied with ultrahigh-resolution photoemission spectroscopy

Physical Review B - Condensed Matter and Materials Physics 64 巻 17 号 172504- 頁 2001-11-01 発行
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ファイル情報(添付)
タイトル ( eng )
Electronic structure and superconducting gap of silicon clathrate Ba8Si46 studied with ultrahigh-resolution photoemission spectroscopy
作成者
Yokoya T.
Fukushima A.
Kiss T.
Kobayashi K.
Shin S.
Moriguchi K.
Shintani A.
収録物名
Physical Review B - Condensed Matter and Materials Physics
64
17
開始ページ 172504
抄録
We study the electronic structure and superconducting transition of silicon clathrate Ba8Si46 (Tc=8 K) using photoemission spectroscopy. We observe a narrow band at the Fermi level (EF), whose width (∼0.3 eV) is substantially smaller than that of band structure calculations (∼1.5 eV). Ultrahigh-resolution measurements show a superconducting gap at 5.4 K [2Δ(0)/kBTc=3.51]. Fine structures associated with phonons are observed within 70 meV of EF. These results characterize Ba8Si46 as a weak-coupling superconductor most probably driven by phonon.
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
American Physical Society
発行日 2001-11-01
権利情報
Copyright (c) 2001 American Physical Society
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[NCID] AA11187113
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.64.172504
[DOI] http://dx.doi.org/10.1103/PhysRevB.64.172504