High-resolution photoemission study of low-Tc superconductors: Phonon-induced electronic structures in low-Tc superconductors and comparison with the results of high-Tc cuprates

T. Yokoya, A. Chainani, T. Kiss, S. Shin, K. Hirata, N. Kameda, T. Tamegai, T. Nishio, H. Uwe

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8 引文 斯高帕斯(Scopus)

摘要

Recent advances in the energy resolution and cryogenic techniques used in photoemission spectroscopy have enabled us to directly observe the superconducting electronic structure of superconductors with a relatively lower transition temperature (low-Tc). In this paper, we report photoemission results on low-Tc superconductors measured with an ultrahigh-resolution low-temperature photoemission spectrometer. The result of Nb3Al exhibits a superconducting gap and a phonon-induced peak-dip-hump structure characteristic of the strong-coupling superconducting spectral function. From measurements of Ba0.67K0.33BiO3, we observe isotropic s-wave superconducting gap opening below Tc as well as depletion of intensity near the Fermi level above Tc, which can be attributed to a phonon-induced pseudogap. We will compare these photoemission results with those of high-Tc superconductors.

原文English
頁(從 - 到)97-101
頁數5
期刊Physica C: Superconductivity and its applications
378-381
發行號PART 1
DOIs
出版狀態Published - 2002 十月 1

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 能源工程與電力技術
  • 電氣與電子工程

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