Origin of in-plane anisotropy in optical conductivity for antiferromagnetic metallic phase of iron pnictides

Koudai Sugimoto, Eiji Kaneshita, Takami Tohyama

研究成果: Article

30 引用 (Scopus)

抄録

We examine the optical conductivity in antiferromagnetic (AFM) iron pnictides by mean-field calculation in a fiveband Hubbard model. The calculated spectra are well consistent with the in-plane anisotropy observed in the measurements, where the optical conductivity along the direction with the AFM alignment of neighboring spins is larger than that along the ferromagnetic (FM) direction in the low-energy region; however, that along the FM direction becomes larger in the higher-energy region. The difference between the two directions is explained by taking account of orbital characters in both occupied and unoccupied states as well as of the nature of Dirac-type linear dispersions near the Fermi level.

元の言語English
記事番号033706
ジャーナルJournal of the Physical Society of Japan
80
発行部数3
DOI
出版物ステータスPublished - 2011 3 1
外部発表Yes

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Group 5A compounds
iron
conductivity
anisotropy
alignment
orbitals
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

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abstract = "We examine the optical conductivity in antiferromagnetic (AFM) iron pnictides by mean-field calculation in a fiveband Hubbard model. The calculated spectra are well consistent with the in-plane anisotropy observed in the measurements, where the optical conductivity along the direction with the AFM alignment of neighboring spins is larger than that along the ferromagnetic (FM) direction in the low-energy region; however, that along the FM direction becomes larger in the higher-energy region. The difference between the two directions is explained by taking account of orbital characters in both occupied and unoccupied states as well as of the nature of Dirac-type linear dispersions near the Fermi level.",
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AU - Kaneshita, Eiji

AU - Tohyama, Takami

PY - 2011/3/1

Y1 - 2011/3/1

N2 - We examine the optical conductivity in antiferromagnetic (AFM) iron pnictides by mean-field calculation in a fiveband Hubbard model. The calculated spectra are well consistent with the in-plane anisotropy observed in the measurements, where the optical conductivity along the direction with the AFM alignment of neighboring spins is larger than that along the ferromagnetic (FM) direction in the low-energy region; however, that along the FM direction becomes larger in the higher-energy region. The difference between the two directions is explained by taking account of orbital characters in both occupied and unoccupied states as well as of the nature of Dirac-type linear dispersions near the Fermi level.

AB - We examine the optical conductivity in antiferromagnetic (AFM) iron pnictides by mean-field calculation in a fiveband Hubbard model. The calculated spectra are well consistent with the in-plane anisotropy observed in the measurements, where the optical conductivity along the direction with the AFM alignment of neighboring spins is larger than that along the ferromagnetic (FM) direction in the low-energy region; however, that along the FM direction becomes larger in the higher-energy region. The difference between the two directions is explained by taking account of orbital characters in both occupied and unoccupied states as well as of the nature of Dirac-type linear dispersions near the Fermi level.

KW - Anisotropy

KW - Drude component

KW - Iron pnictide

KW - Magnetically ordered state

KW - Mean-field approximation

KW - Optical conductivity

KW - Superconductivity

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