Two pseudogaps with different energy scales at the antinode of the high-temperature Bi${}_{2}$Sr${}_{2}$CuO${}_{6}$ superconductor using angle-resolved photoemission spectroscopy

Two pseudogaps with different energy scales at the antinode of the high-temperature Bi $_{2}$ Sr $_{2}$ CuO $_{6}$ 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, and T. Takahashi

Phys. Rev. B 83, 224509 – Published 23 June 2011

Abstract

We 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 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 understanding the pseudogap phenomena in cuprates.

Received 26 May 2011

DOI:https://doi.org/10.1103/PhysRevB.83.224509

Authors & Affiliations

K. Nakayama¹, T. Sato¹, Y.-M. Xu^2,*, Z.-H. Pan^2,†, P. Richard^3,4, H. Ding^2,4, H.-H. Wen^4,‡, K. Kudo^5,§, T. Sasaki⁵, N. Kobayashi⁵, and T. Takahashi^1,3

¹Department of Physics, Tohoku University, Sendai 980-8578, Japan
²Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
³World Premier International Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
⁴Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
⁵Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

^*Present address: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
^†Present address: Condensed Matter Physics and Materials Science Department, Brookhaven National Lab, Upton, NY 11973, USA.
^‡Present address: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
^§Present address: Department of Physics, Okayama University, Okayama 700-8530, Japan.

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Vol. 83, Iss. 22 — 1 June 2011

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