Signatures of Electronic Correlations in Optical Properties ofLaFeAsO1−xFx

Spin-density-wave-induced anomalies in the optical conductivity ofAFe2As2, (Charnukha1, Pröpper2, Larkin3 et al. 2013Phys. Rev. BSelf Cite2717531View full textAdd to dashboardCite

“…The full complex optical conductivity σ(ω) was obtained in the range 100 − 52000 cm −1 using broad band ellipsometry, as described in Ref. 53. The measurements in the lowest farinfrared spectral range were carried out at the infrared beamline of the ANKA synchrotron light source at Karlsruhe Institute of Technology, Germany.…”

Large resistivity change and phase transition in the antiferromagnetic semiconductors LiMnAs and LaOMnAs

“…We note that the main features resemble those that characterize the interband electronic contribution to the dielectric function of polycrystalline LaOFeAs, while shifted by ∼0.7 eV to higher energy. 39 The rise of ε 2 (ω) above 0.4 eV can be attributed to indirect interband transitions.…”

“…One can clearly distinguish three optical bands peaked at ∼1.4, ∼2.1, and ∼3.2 eV. 39 These transitions provide the main contribution to the static permittivity and form the direct absorption edge, below which the real part of the dielectric permittivity becomes nearly constant down to the phonon frequencies, ε 1 (0.2 eV ω 1.2 eV) ≈ 8. We note that the main features resemble those that characterize the interband electronic contribution to the dielectric function of polycrystalline LaOFeAs, while shifted by ∼0.7 eV to higher energy.…”

Magnetic phase diagram of an extendedJ1−J2model on a modulated square lattice and its implications for the antiferromagnetic phase of KyFeYu1, Goswami2, Si3 2011Phys. Rev. B311190View full textAdd to dashboardCite

“…On one hand, the (π, 0) collinear antiferromagnetic order arises in a weak coupling picture that relies on the presence of quasi-nested electron and hole pockets respectively at M and Γ points of the extended Brillouin zone 12 . On the other hand, the experimentally observed large electrical resistivity ("bad metal" with k F l ∼ 1), a strong suppression of Drude weight 4 , and the temperatureinduced spectral weight transfer [5][6][7] have suggested sizable strength of electronic correlations. These experimental evidences have suggested the placement of the iron pnictides in close proximity of a putative Mott transition [8][9][10] .…”