Normal-state charge dynamics in doped BaFe2As2: Roles of doping and necessary ingredients for superconductivity

Nakajima, M.; Ishida, Shigeyuki; Tanaka, T.; Kihou, Kunihiro; Tomioka, Y.; Saito, Taku; Lee, Chul‐Ho; Fukazawa, Hideto; Kohori, Yoh; Kakeshita, T.; Iyo, A.; T, Ito; Eisaki, H.; Uchida, S.

doi:10.1038/srep05873

Cited by 56 publications

(59 citation statements)

References 47 publications

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“…Large mass enhancements have been measured in KFe 2 As 2 by quantum oscillations [197] and ARPES [198]. The Drude peak in KFe 2 As 2 is strongly suppressed [199,200] when compared with that of BaFe 2 As 2 in agreement with theoretical estimates [119]. The specific heat enhancement is even larger in CsFe 2 As 2 and RbFe 2 As 2 [201,202], isovalent to KFe 2 As 2 .…”

Section: Insight From Ab-initio Calculationssupporting

confidence: 71%

Magnetic interactions in iron superconductors: A review

Bascones

Valenzuela

Calderón

2015

Comptes Rendus. Physique

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High temperature superconductivity in iron pnictides and chalcogenides emerges when a magnetic phase is suppressed. The multi-orbital character and the strength of correlations underlie this complex phenomenology, involving magnetic softness and anisotropies, with Hund's coupling playing an important role. We review here the different theoretical approaches used to describe the magnetic interactions in these systems. We show that taking into account the orbital degree of freedom allows us to unify in a single phase diagram the main mechanisms proposed to explain the (π, 0) order in iron pnictides: the nesting-driven, the exchange between localized spins, and the Hund induced magnetic state with orbital differentiation. Comparison of theoretical estimates and experimental results helps locate the Fe superconductors in the phase diagram. In addition, orbital physics is crucial to address the magnetic softness, the doping dependent properties, and the anisotropies.

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Section: Insight From Ab-initio Calculationssupporting

confidence: 71%

Magnetic interactions in iron superconductors: A review

Bascones

Valenzuela

Calderón

2015

Comptes Rendus. Physique

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“…This can be naturally expected since the end material FeSe shows a good metallic behavior [24]. ρ(300K) can be seen upon Se substitution unlike the case of isovalent P-doped 122 materials where carriers become more coherent with P substitution and resistivity consequently decreases due probably to a chemical pressure effect [25]. is consistent with previous studies [26,27].…”

Section: B Effects Of Se and Cu Substitution In Fe 1+x Tesupporting

confidence: 89%

Reversed anisotropy of the in-plane resistivity in the antiferromagnetic phase of iron tellurides

et al. 2015

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We systematically investigated the anisotropic in-plane resistivity of the iron telluride including three kinds of impurity atoms: excess Fe, Se substituted for Te, and Cu substituted for Fe. Sizable resistivity anisotropy was found in the magneto-structurally ordered phase whereas the sign is opposite (ρ a > ρ b , where the b-axis parameter is shorter than the a-axis one) to that observed in the transition-metal doped iron arsenides (ρ a < ρ b ). On the other hand, our results demonstrate that the magnitude of the resistivity anisotropy in the iron tellurides is correlated with the amount of impurities, implying that the resistivity anisotropy originates from an exotic impurity effect like that in the iron arsenides. This suggests that the anisotropic carrier scattering by impurities is a universal phenomenon in the magneto-structurally ordered phase of the iron-based materials.

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“…5). Accordingly, the electronic correlations remain in the strongly correlated regime for all studied pressures 32 .…”

Section: Resultsmentioning

confidence: 78%

“…The fraction of the narrow Drude weight, N N DC /N ef f , is a measure of the degree of coherence of the carrier dynamics and was suggested as a measure of electronic correlations 32 . Fig.…”

Section: Resultsmentioning

confidence: 99%

Optical study of BaFe2As2 under pressure: Coexistence of spin-density-wave gap and superconductivity

et al. 2015

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Temperature-dependent reflectivity measurements in the frequency range 85 -7000 cm −1 were performed on BaFe2As2 single crystals under pressure up to ∼5 GPa. The corresponding pressureand temperature-dependent optical conductivity was analyzed with the Drude-Lorentz model to extract the coherent and incoherent contributions. The gradual suppression of the spin-density wave (SDW) state with increasing pressure and the appearance of the superconducting phase coexisting with the SDW phase at 3.6 GPa were observed. At 3.6 GPa, the reflectivity reaches unity below ∼95 cm −1 indicating the opening of the superconducting gap and shows a full gap tendency at 6 K.

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Normal-state charge dynamics in doped BaFe2As2: Roles of doping and necessary ingredients for superconductivity

Cited by 56 publications

References 47 publications

Magnetic interactions in iron superconductors: A review

Magnetic interactions in iron superconductors: A review

Reversed anisotropy of the in-plane resistivity in the antiferromagnetic phase of iron tellurides

Optical study of BaFe2As2 under pressure: Coexistence of spin-density-wave gap and superconductivity

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