Angle-resolved photoemission spectroscopy study of PrFeAsO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>0</mml:mn><mml:mo>.</mml:mo><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Comparison with LaFePO

Nishi, I.; Ishikado, M.; Ideta, S.; Malaeb, Walid; Yoshida, T.; Fujimori, A.; Kotani, Yoshinori; Kubota, Masato; Ono, Kanta; Yi, Ming; Lü, Donghui; Moore, Robert; Shen, Z.‐X.; Iyo, A.; Kihou, Kunihiro; Kitô, Hijiri; Eisaki, H.; Shamoto, S.; Arita, Ryotaro

doi:10.1103/physrevb.84.014504

Cited by 25 publications

(25 citation statements)

References 33 publications

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“…These results clearly indicate that the outer band with holelike dispersion at the Γ point, generating the largest circular feature shown as an orange dashed circle in Fig. 1c, is significantly suppressed in the aged material (see Supplementary Information), consistent with previous reports on related compounds2121314151617181920. The extrinsic character of the second outermost hole band at the Γ point follows from its incompatibility with the characteristic properties of the low-energy electronic band structure predicted by ab initio calculations (see Supplementary Information).…”

supporting

confidence: 91%

Interaction-induced singular Fermi surface in a high-temperature oxypnictide superconductor

Charnukha

Thirupathaiah

Zabolotnyy

et al. 2015

Sci Rep

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In the family of iron-based superconductors, LaFeAsO-type materials possess the simplest electronic structure due to their pronounced two-dimensionality. And yet they host superconductivity with the highest transition temperature Tc ≈ 55K. Early theoretical predictions of their electronic structure revealed multiple large circular portions of the Fermi surface with a very good geometrical overlap (nesting), believed to enhance the pairing interaction and thus superconductivity. The prevalence of such large circular features in the Fermi surface has since been associated with many other iron-based compounds and has grown to be generally accepted in the field. In this work we show that a prototypical compound of the 1111-type, SmFe0.92Co0.08AsO , is at odds with this description and possesses a distinctly different Fermi surface, which consists of two singular constructs formed by the edges of several bands, pulled to the Fermi level from the depths of the theoretically predicted band structure by strong electronic interactions. Such singularities dramatically affect the low-energy electronic properties of the material, including superconductivity. We further argue that occurrence of these singularities correlates with the maximum superconducting transition temperature attainable in each material class over the entire family of iron-based superconductors.

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supporting

confidence: 91%

Interaction-induced singular Fermi surface in a high-temperature oxypnictide superconductor

Charnukha

Thirupathaiah

Zabolotnyy

et al. 2015

Sci Rep

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“…Therefore, the nature of electronic spectral function at different k-point of Brillouin zone is different. These results are viewed qualitatively in accordance to the experimental photoemission observation where the spectral intensity corresponding to d xy orbital states has not seen clearly at C(0, 0) point due to matrix element effect [25,44]. It is also observed that at electron pocket spectral peak shows presence of all three orbital states near the Fermi level [17] in LaOFeP, and indicate the significance of multi-orbital physics in superconducting iron pnictides.…”

Section: Resultssupporting

confidence: 91%

Influence of multi-orbital hopping and anisotropy in intra and inter orbital Coulomb interactions on the electronic spectra in iron pnictide superconductors

Rani

Ajay

2015

Physica C: Superconductivity and its Applications

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“…The deviation of the FS volume implies that there is excess hole doping of 0.11 per Fe atom at the sample surface. Nevertheless, the surface effect is not so serious as those in 1111 system where excess 0.5-0.6 holes per Fe are doped [28], and one can still discuss mass renormalization from the present result.…”

Section: Resultsmentioning

confidence: 76%

Orbital character and electron correlation effects on two- and three-dimensional Fermi surfaces in KFe2As2 revealed by angle-resolved photoemission spectroscopy

et al. 2014

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We have investigated orbital character and electron correlation effects on Fermi surfaces in the hole-overdoped iron pnictide superconductor KFe 2 As 2 , which shows a low T c of ∼4 K, by angle-resolved photoemission spectroscopy. From the polarization-dependence of the ARPES spectra, we have determined the orbital character of each Fermi surface. Electron mass renormalization of each band is quantitatively consistent with de Haas-van Alphen results. The outer β and middle ζ Fermi surfaces show large renormalization factor of m * /m b ∼6-7, while the inner α Fermi surface has a smaller factor m * /m b ∼2. Middle hole Fermi surface ζ has strong three-dimensionality compared to other Fermi surfaces, indicating the d 3z2−r2 orbital character, which may be related to the "octet-line nodes" recently observed by laser ARPES. The observed orbital-dependent mass renormalization would give constraints on the pairing mechanism with line nodes of this system.

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Angle-resolved photoemission spectroscopy study of PrFeAsO0.7: Comparison with LaFePO

Cited by 25 publications

References 33 publications

Interaction-induced singular Fermi surface in a high-temperature oxypnictide superconductor

Interaction-induced singular Fermi surface in a high-temperature oxypnictide superconductor

Influence of multi-orbital hopping and anisotropy in intra and inter orbital Coulomb interactions on the electronic spectra in iron pnictide superconductors

Orbital character and electron correlation effects on two- and three-dimensional Fermi surfaces in KFe2As2 revealed by angle-resolved photoemission spectroscopy

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