Parameter dependence of optical conductivity in antiferromagnetic phase of iron pnictides

Koudai Sugimoto, E. Kaneshita, T. Tohyama

Research output: Contribution to journalArticle

Abstract

We investigate the optical conductivity of iron pnictides in antiferromagnetic state by mean-field calculation in a five-band Hubbard model, focusing on its anisotropic behavior by examining several states calculated with different Hund coupling J, such as the states with a low or high magnetization and with or without a strong orbital ordering. In addition, we investigate the J dependence of the Dirac cone structure, which is crucial for the low energy excitation. In our calculations, a weakly ordered state with no orbital ordering shows the anisotropy of optical conductivity in accord with experiments. We conclude that the low energy part of the optical conductivity is relevant to the Dirac electron structure rather than the orbital ordering.

Original languageEnglish
Pages (from-to)666-669
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume471
Issue number21-22
DOIs
Publication statusPublished - 2011 Nov 1
Externally publishedYes

Fingerprint

Optical conductivity
Group 5A compounds
Iron
iron
orbitals
conductivity
Hubbard model
Excitation energy
Cones
Magnetization
cones
Anisotropy
magnetization
anisotropy
energy
Electrons
excitation
electrons
Experiments

Keywords

  • Anisotropy
  • Dirac cone
  • Iron pnictide superconductor
  • Optical conductivity

ASJC Scopus subject areas

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

Cite this

Parameter dependence of optical conductivity in antiferromagnetic phase of iron pnictides. / Sugimoto, Koudai; Kaneshita, E.; Tohyama, T.

In: Physica C: Superconductivity and its applications, Vol. 471, No. 21-22, 01.11.2011, p. 666-669.

Research output: Contribution to journalArticle

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