Two pseudogaps with different energy scales at the antinode of the high-temperature Bi2Sr2CuO6 superconductor using angle-resolved photoemission spectroscopy

K. Nakayama, T. Sato, Y. M. Xu, Z. H. Pan, P. Richard, H. Ding, H. H. Wen, K. Kudo, T. Sasaki, N. Kobayashi, T. Takahashi

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We performed high-resolution angle-resolved photoemission spectroscopy on single-layered cuprate Bi2Sr2CuO6 to clarify the origin of the pseudogap. By using various photon energies, we succeeded in directly observing two different pseudogaps with two different energy scales which coexist in the antinodal region: one reflects the dx2-y2-wave pairing strength while the other has a larger energy scale suggesting an origin distinct from superconductivity. The observed two-pseudogap behavior provides a key to fully understanding the pseudogap phenomena in cuprates.

Original languageEnglish
Article number224509
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
Publication statusPublished - Jun 23 2011


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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