Ultralow-dissipative conductivity by dirac fermions in BaFe 2As2

Yoshinori Imai; Fuyuki Nabeshima; Daisuke Nakamura; Takayoshi Katase; Hidenori Hiramatsu; Hideo Hosono; Atsutaka Maeda

doi:10.7566/JPSJ.82.043709

Ultralow-dissipative conductivity by dirac fermions in BaFe ₂As₂

Yoshinori Imai, Fuyuki Nabeshima, Daisuke Nakamura, Takayoshi Katase, Hidenori Hiramatsu, Hideo Hosono, Atsutaka Maeda

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

We report on the anomalous behavior of the complex conductivity of BaFe₂As₂, which is considered to be related to the Dirac cone, in the terahertz (THz)-frequency region. Above the spin-density-wave (SDW) transition temperature, the conductivity spectra follow the Drude formula. In the SDW state, the imaginary part of the conductivity, σ₂, is suppressed in comparison with that expected according to the Drude model, whereas the real part, σ₁, exhibits nearly Drude-like behavior. This behavior (i.e., almost no changes in σ₁ and the depression of σ₂) can be regarded as reflecting the addition of extra conductivity without any dissipations in the Drude-type conductivity. We argue that the origin of this ultralow-dissipative conductivity is found to be the contribution from quasiparticles within the Dirac cone.

Original language	English
Article number	043709
Journal	journal of the physical society of japan
Volume	82
Issue number	4
DOIs	https://doi.org/10.7566/JPSJ.82.043709
Publication status	Published - 2013 Apr
Externally published	Yes

Keywords

BaFe As
Dirac cone
Iron-based superconductors
THz conductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.7566/JPSJ.82.043709

Cite this

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title = "Ultralow-dissipative conductivity by dirac fermions in BaFe 2As2",

abstract = "We report on the anomalous behavior of the complex conductivity of BaFe2As2, which is considered to be related to the Dirac cone, in the terahertz (THz)-frequency region. Above the spin-density-wave (SDW) transition temperature, the conductivity spectra follow the Drude formula. In the SDW state, the imaginary part of the conductivity, σ2, is suppressed in comparison with that expected according to the Drude model, whereas the real part, σ1, exhibits nearly Drude-like behavior. This behavior (i.e., almost no changes in σ1 and the depression of σ2) can be regarded as reflecting the addition of extra conductivity without any dissipations in the Drude-type conductivity. We argue that the origin of this ultralow-dissipative conductivity is found to be the contribution from quasiparticles within the Dirac cone.",

keywords = "BaFe As, Dirac cone, Iron-based superconductors, THz conductivity",

author = "Yoshinori Imai and Fuyuki Nabeshima and Daisuke Nakamura and Takayoshi Katase and Hidenori Hiramatsu and Hideo Hosono and Atsutaka Maeda",

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T1 - Ultralow-dissipative conductivity by dirac fermions in BaFe 2As2

AU - Imai, Yoshinori

AU - Nabeshima, Fuyuki

AU - Nakamura, Daisuke

AU - Katase, Takayoshi

AU - Hiramatsu, Hidenori

AU - Hosono, Hideo

AU - Maeda, Atsutaka

PY - 2013/4

Y1 - 2013/4

N2 - We report on the anomalous behavior of the complex conductivity of BaFe2As2, which is considered to be related to the Dirac cone, in the terahertz (THz)-frequency region. Above the spin-density-wave (SDW) transition temperature, the conductivity spectra follow the Drude formula. In the SDW state, the imaginary part of the conductivity, σ2, is suppressed in comparison with that expected according to the Drude model, whereas the real part, σ1, exhibits nearly Drude-like behavior. This behavior (i.e., almost no changes in σ1 and the depression of σ2) can be regarded as reflecting the addition of extra conductivity without any dissipations in the Drude-type conductivity. We argue that the origin of this ultralow-dissipative conductivity is found to be the contribution from quasiparticles within the Dirac cone.

AB - We report on the anomalous behavior of the complex conductivity of BaFe2As2, which is considered to be related to the Dirac cone, in the terahertz (THz)-frequency region. Above the spin-density-wave (SDW) transition temperature, the conductivity spectra follow the Drude formula. In the SDW state, the imaginary part of the conductivity, σ2, is suppressed in comparison with that expected according to the Drude model, whereas the real part, σ1, exhibits nearly Drude-like behavior. This behavior (i.e., almost no changes in σ1 and the depression of σ2) can be regarded as reflecting the addition of extra conductivity without any dissipations in the Drude-type conductivity. We argue that the origin of this ultralow-dissipative conductivity is found to be the contribution from quasiparticles within the Dirac cone.

KW - BaFe As

KW - Dirac cone

KW - Iron-based superconductors

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