Unusual band renormalization in the simplest iron-based superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>FeSe</mml:mtext><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>

Maletz, J.; Zabolotnyy, V. B.; Evtushinsky, D. V.; Thirupathaiah, S.; Wolter, A. U. B.; Harnagea, Luminita; Yaresko, A. N.; Vasiliev, A. N.; Чареев, Д. А.; Böhmer, Anna E.; Hardy, F.; Wolf, Th.; Meingast, C.; Rienks, E. D. L.; Büchner, B.; Борисенко, С. В.

doi:10.1103/physrevb.89.220506

Cited by 183 publications

(244 citation statements)

References 35 publications

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“…The obtained electronic state captures the experimental result, namely the absence of the xy-orbital hole pocket. 27,28) In Figs. 2(a) and 2(b), we show the xy and zx orbital components of the spin susceptibility obtained by the RPA and DMFT, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The absence of a hole Fermi surface composed of the xy orbital is in agreement with experiments. 27,28) The experimental results of the NMR spin-relaxation rate, 24,25) in which the spin fluctuation is very weak above the structural transition, was verified. We show that the orbital fluctuation enhanced owing to the orbital-polarization interaction.…”

Section: Introductionmentioning

confidence: 82%

“…Above T s (at a high temperature), ARPES experiments [27][28][29][30] found that hole Fermi surfaces consist of two small pockets of mainly d zx and d yz character around the Γ-Z line. A narrow d xy hole band also exists in ∼50 meV below the Fermi level.…”

Section: Introductionmentioning

confidence: 99%

“…The larger Coulomb interaction yields larger mass enhancement with significant orbital dependence. 44,45) However, the origin of unusual electronic states observed in experiments 27,28) has been a controversial issue.…”

Section: Introductionmentioning

confidence: 99%

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Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

et al. 2018

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The pressure dependence of the structural (Ts), antiferromagnetic (Tm), and superconducting (Tc) transition temperatures in FeSe is investigated on the basis of the 16-band d-p model. At ambient pressure, a shallow hole pocket disappears due to the correlation effect, as observed in the angular-resolved photoemission spectroscopy (ARPES) and quantum oscillation (QO) experiments, resulting in the suppression of the antiferromagnetic order, in contrast to the other iron pnictides. The orbital-polarization interaction between the Fe d orbital and Se p orbital is found to drive the ferro-orbital order responsible for the structural transition without accompanying the antiferromagnetic order. The pressure dependence of the Fermi surfaces is derived from the first-principles calculation and is found to well account for the opposite pressure dependences of Ts and Tm, around which the enhanced orbital and magnetic fluctuations cause the double-dome structure of the eigenvalue λ in the Eliashberg equation, as consistent with that of Tc in FeSe.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

et al. 2018

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“…As is well known, the self-energy correction have been understood as describing the non Fermi-liquid behavior, 23 the orbital selective change in the band dispersion 24 and the orbital selective Mott transition 25 as observed in recent experiments. [26][27][28] However, the effect of the two particle vertex correction have not been fully understood in the multi-orbital system. The purpose of this paper is to clarify the relation between the vertex correction and superconductivity in the wide parameter region.…”

Section: Introductionmentioning

confidence: 99%

Hole-s_± State Induced by Coexisting Ferro- and Antiferromagnetic and Antiferro-orbital Fluctuations in Iron Pnictides

et al. 2016

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The multi-orbital Hubbard model is investigated in order to clarify the electron correlation effects and the superconductivity in the iron-based superconductor. The renormalization effects on the self-energy and the two-particle irreducible vertex function are calculated on the basis of the dynamical mean field theory. We find that the vertex function exhibits a strong renormalization with the significant orbital dependence as compared with the renormalization factor, when the antiferromagnetic and the antiferro-orbital fluctuations are comparably enhanced due to the electron and the hole Fermi surfaces nesting effects. The orbital-dependent vertex function together with the q ∼ 0 nesting between the two-hole Fermi surfaces results in the inter-orbital ferromagnetic fluctuation gradually enhanced which is expected to be observed in LiFeAs. We show that the hole-s±-wave superconductivity with the sign change of the two-hole Fermi surfaces is realized by the enhanced ferromagnetic fluctuation accompanied by the antiferromagnetic fluctuation and the antiferro-orbital fluctuation.

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Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

Rößler

Koz

Wirth

et al. 2016

Physica Status Solidi (b)

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This article reviews recent experimental investigations on two binary Fe-chalcogenides: FeSe and Fe1+yTe. The main focus is on synthesis, single crystal growth, chemical composition, as well as on the effect of excess iron on structural, magnetic, and transport properties of these materials. The structurally simplest Fe-based superconductor Fe1+xSe with a critical temperature Tc ≈ 8.5 K undergoes a tetragonal to orthorhombic phase transition at a temperature Ts ≈ 87 K. No longrange magnetic order is observed down to the lowest measured temperature in Fe1+xSe. On the other hand, isostructural Fe1+yTe displays a complex interplay of magnetic and structural phase transitions in dependence on the tuning parameter such as excess amount of Fe or pressure, but it becomes a superconductor only when Te is substituted by a sufficient amount of Se. We summarize experimental evidence for different competing interactions and discuss related open questions.

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Unusual band renormalization in the simplest iron-based superconductorFeSe1−x

Cited by 183 publications

References 35 publications

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

Hole-s_± State Induced by Coexisting Ferro- and Antiferromagnetic and Antiferro-orbital Fluctuations in Iron Pnictides

Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

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Unusual band renormalization in the simplest iron-based superconductorFeSe1−x

Cited by 183 publications

References 35 publications

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

Hole-s± State Induced by Coexisting Ferro- and Antiferromagnetic and Antiferro-orbital Fluctuations in Iron Pnictides

Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

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Hole-s_± State Induced by Coexisting Ferro- and Antiferromagnetic and Antiferro-orbital Fluctuations in Iron Pnictides