Superconducting transitions studied by ultrahigh-resolution photoemission

T. Yokoya, T. Kiss, A. Chainani, S. Shin

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

Superconducting transitions of elemental metals and Ni borocarbides are studied using ultrahigh-resolution and low-temperature photoemission spectroscopy. Photoemission spectra of elemental metals (Nb and Pb) show the appearance of a sharp peak just below the Fermi level and a shift of the leading edge, indicating clear opening of the superconducting gap. Furthermore, Pb spectrum shows a dip and hump structure beyond the peak, characteristic of the strong-coupling superconductivity. On the other hand, comparative study of Y(Ni1-xPtx)2B2C (x=0.0 and 0.2) shows a difference in the slope of the leading edge, which can be explained in terms of a highly anisotropic s-wave gap in YNi2B2C, consistent to magnetic field dependent specific heat measurements. These observations demonstrate that photoemission spectroscopy is a useful and reliable technique to study electronic structures and phase transitions at very small energy scales.

原文English
文章編號4373
頁(從 - 到)99-105
頁數7
期刊Journal of Electron Spectroscopy and Related Phenomena
124
發行號2-3
DOIs
出版狀態Published - 2002

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 輻射
  • 原子與分子物理與光學
  • 凝聚態物理學
  • 光譜
  • 物理與理論化學

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