Signature of excitonic effect in BaFe2As2 revealed by angle-resolved photoemission spectroscopy

Y. Wakisaka, T. Sudayama, K. Takubo, R. Morinaga, T. J. Sato, M. Arita, H. Namatame, M. Taniguchi, Takashi Mizokawa

Research output: Contribution to journalArticle

Abstract

We report on an electronic structural study of BaFe2As 2 which has a spin-density-wave (SDW) transition and is a parent material of FeAs-based superconductors. Angle-resolved photoemission spectroscopy on BaFe2As2 shows that, across the SDW transition, the spectral weight at 0-100 meV below EF is reconstructed to form flat bands and Fermi surfaces in the SDW state. The coexistence of the Fermi surfaces and the flat band supports the orbital-dependent excitonic coupling between electron and hole pockets rather than the simple Fermi surface nesting as the origin of the SDW state.

Original languageEnglish
JournalPhysica C: Superconductivity and its Applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec
Externally publishedYes

Fingerprint

Spin density waves
Photoelectron spectroscopy
Fermi surface
photoelectric emission
signatures
Fermi surfaces
spectroscopy
Superconducting materials
orbitals
Electrons
electronics
electrons

Keywords

  • Excitonic coupling
  • Iron pnictides
  • SDW

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials

Cite this

Signature of excitonic effect in BaFe2As2 revealed by angle-resolved photoemission spectroscopy. / Wakisaka, Y.; Sudayama, T.; Takubo, K.; Morinaga, R.; Sato, T. J.; Arita, M.; Namatame, H.; Taniguchi, M.; Mizokawa, Takashi.

In: Physica C: Superconductivity and its Applications, Vol. 470, No. SUPPL.1, 12.2010.

Research output: Contribution to journalArticle

Wakisaka, Y. ; Sudayama, T. ; Takubo, K. ; Morinaga, R. ; Sato, T. J. ; Arita, M. ; Namatame, H. ; Taniguchi, M. ; Mizokawa, Takashi. / Signature of excitonic effect in BaFe2As2 revealed by angle-resolved photoemission spectroscopy. In: Physica C: Superconductivity and its Applications. 2010 ; Vol. 470, No. SUPPL.1.
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