Two different types of pseudogaps in high-Tc superconductors

T. Takahashi, T. Sato, T. Yokoya, T. Kamiyama, Y. Naitoh, T. Mochiku, K. Yamada, Y. Endoh, K. Kadowaki

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Ultrahigh-resolution (ΔE = 7 meV angle-resolved (ARPES) and angle-integrated (AIPES) photoemission spectroscopy have been performed on optimally doped Bi2Sr2CaCu2O8 (Bi2212) and La1.85Sr0.15CuO4 (LSCO). The ARPES spectrum of Bi2212 at the (π, 0)-(π, π) crossing shows a pseudogap at EF above Tc, which is smoothly connected from the superconducting gap across Tc and closes slightly above Tc (T* = 110 K). On the other hand, the AIPES spectra both in Bi2212 and LSCO show a remarkable depletion of the density of states in a relatively wider energy (100-150 meV) region near EF. The temperature-induced filling of the depletion persists far above Tc and T*. This suggests that there are two different pseudogaps in the high-Tc superconductors; one is likely associated with pairing and the other is attributed to the development of antiferromagnetic correlation.

本文言語English
ページ(範囲)41-45
ページ数5
ジャーナルJournal of Physics and Chemistry of Solids
62
1-2
DOI
出版ステータスPublished - 2001 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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