Nanoscale electronic structure of the layered nitride superconductors α-KxTiNCl and β-HfNCly observed by scanning tunneling microscopy and spectroscopy
Physical Review B 85 巻 14 号
144517- 頁
2012 発行
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タイトル ( eng ) |
Nanoscale electronic structure of the layered nitride superconductors α-KxTiNCl and β-HfNCly observed by scanning tunneling microscopy and spectroscopy
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作成者 |
Shohara Kazuhiro
Zheng Zhanfeng
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収録物名 |
Physical Review B
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巻 | 85 |
号 | 14 |
開始ページ | 144517 |
抄録 |
Scanning tunneling microscopy and spectroscopy (STM-STS) measurements have been carried out on the α (FeOCl)–type KxTiNCl (x∼0.5, Tc=16 K) and β (SmSI)–type HfNCly (y∼0.7, Tc=24 K) layered nitride superconductors. The STM images at 5 K showed clear atomic arrangements for both the compounds, namely, the rectangular lattice on α-KxTiNCl and the triangular lattice on β-HfNCly. The tunneling spectra in the superconducting states at low temperatures demonstrate qualitatively different features between these superconductors. For α-KxTiNCl, the spatial distributions of the density of states and the superconducting gap structures are very inhomogeneous, while those on β-HfNCly are found to be almost homogeneous. The nanoscale electronic features between these compounds correlate with the different lattice structures of the M (=Ti or Hf) N conducting layers, which are caused by the lattice symmetry difference itself or induced by the difference in the local doping distributions in these chemically reactive compounds. The averaged gap magnitudes in the superconducting states, Δ̅ ≃10.2 meV and 7.5 meV for α-KxTiNCl and β-HfNCly, corresponding to the gap ratios 2Δ̅ /kBTc≃ 15 and 7.2, respectively, indicate the unusually strong coupling effects of the superconductivity.
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NDC分類 |
物理学 [ 420 ]
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言語 |
英語
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資源タイプ | 学術雑誌論文 |
出版者 |
American Physical Society
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発行日 | 2012 |
権利情報 |
(c) 2012 American Physical Society
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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 |
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.85.144517
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.85.144517
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