Physics – Condensed Matter – Superconductivity
Scientific paper
2011-05-30
Phys. Rev. B 83, 224509 (2011)
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures
Scientific paper
We have performed high-resolution angle-resolved photoemission spectroscopy on single-layered cuprate Bi$_2$Sr$_2$CuO$_6$ to clarify the origin of the pseudogap. By using various photon energies, we have succeeded in directly observing two different pseudogaps with two different energy scales which coexist in the antinodal region: one reflects the $d_{x^2-y^2}$-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 understand the pseudogap phenomena in cuprates.
Ding Haibing
Kobayashi Nami
Kudo Kazue
Nakayama Kazunori
Pan Z.-H.
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