Shallow pockets and very strong coupling superconductivity in FeSexTe1−x

Lubashevsky, Y.; Lahoud, E.; Chashka, K. B.; Podolsky, Daniel K.; Kanigel, Amit

doi:10.1038/nphys2216

Cited by 152 publications

(177 citation statements)

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“…The butterfly and the cloverleaf ARPES features originate from the main and the replica hole pockets. The signatures of the electron FS sheets are weak and broad, as is usually the case in Te-rich samples [20][21][22][23][24][25]. Here, we focus on the hole FS sheets.…”

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confidence: 99%

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Consequences of Broken Translational Symmetry inFeSexTe1−x

Moreschini

Lin

et al. 2014

Phys. Rev. Lett.

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We investigate the consequences of broken translational symmetry in the superconductor FeSe x Te 1−x using angle-resolved photoemission spectroscopy. We find that the intensity does not follow the periodicity dictated by the crystal structure, owing to the form of the perturbing potential and the symmetries of the Fe d orbitals. Their interplay leads to substantial differences in the orbital character and spectral features observed at nominally equivalent locations in the reciprocal space. Such differences cannot be accounted for by the usual dipole matrix element effects and are due instead to the structure factor, which must be explicitly considered whenever more than one atom is present in the unit cell.

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confidence: 99%

“…We now consider, separately, the hole FS sheets formed at Γ and M. Butterfly shapes have been observed at the Γ point in the "11" compounds [22,24] and in LiFeAs [27]. They represent portions of the nearly circular hole FS contours selected by strong polarization effects, as illustrated in Fig.…”

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confidence: 99%

Consequences of Broken Translational Symmetry inFeSexTe1−x

Moreschini

Lin

et al. 2014

Phys. Rev. Lett.

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“…Therefore, research on the composition dependence of J c is necessary to clarify the optimal composition for application of these materials, as well as improvement of J c characteristics by introduction of artificial pinning centers. In view of fundamental study, on the other hand, FeSe 1−x Te x is unique in that (i) FeSe shows a structural transition without a magnetic order unlike other iron-based superconductors and in that (ii) FeSe 1−x Te x is considered to be in the BCS-BEC crossover region because of its very large ∆/ F (∆ and F are the superconducting gap size and the Fermi energy, respectively) [137][138][139]. Although it has been an obstacle to research on these materials that samples are not available in a wide composition region of 0.1 < x < 0.4, successful growth of single crystalline films in a whole composition region will promote progress in the research.…”

Section: -Systemmentioning

confidence: 99%

Comparative Review on Thin Film Growth of Iron-Based Superconductors

2017

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Abstract:Since the discovery of the novel iron-based superconductors, both theoretical and experimental studies have been performed intensively. Because iron-based superconductors have a smaller anisotropy than high-T c cuprates and a high superconducting transition temperature, there have been a lot of researchers working on the film fabrication of iron-based superconductors and their application. Accordingly, many novel features have been reported in the films of iron-based superconductors, for example, the fabrication of the epitaxial film with a higher T c than bulk samples, the extraction of the metastable phase which cannot be obtained by the conventional solid state reaction, and so on. In this paper, we review the progress of research on thin film fabrications of iron-based superconductors, especially the four categories: LnFeAs(O,F) (Ln = Lanthanide), AEFe 2 As 2 (AE = Alkaline-earth metal), FeCh (Ch = Chalcogen), and FeSe monolayer. Furthermore, we focus on two important topics in thin films of iron-based superconductors; one is the substrate material for thin film growth on the iron-based superconductors, and the other is the whole phase diagram in FeSe 1−x Te x which can be obtained only by using film-fabrication technique.

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“…The authors of Refs. 8,11,12 interpreted this observation as a possible evidence of the Bose-Einstein condensation scenario of superconductivity. The latter assumes that two electrons in an otherwise empty shallow band form a bound state.…”

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confidence: 99%

“…2(b) away from µ = 0 19 . Recent papers 8,11,12 studied the spectrum of excitations in the shallow band of iron-based superconductors and discovered that the minimum energy is achieved at p = 0. This observation is consistent with the scenario shown in the inset of Fig.…”

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confidence: 99%

Anomalous density of states in multiband superconductors near the Lifshitz transition

Koshelev

Матвеев

2014

Phys. Rev. B

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We consider a multiband metal with deep primary bands and a shallow secondary one. In the normal state the system undergoes Lifshitz transition when the bottom of the shallow band crosses the Fermi level. In the superconducting state Cooper pairing in the shallow band is induced by the deep ones. As a result, the density of electrons in the shallow band remains finite even when the bottom of the band is above the Fermi level. We study the density of states in the system and find qualitatively different behaviors on the two sides of the Lifshitz transition. On one side of the transition the density of states diverges at the energy equal to the induced gap, whereas on the other side it vanishes. We argue that this physical picture describes the recently measured gap structure in shallow bands of iron pnictides and selenides.

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Shallow pockets and very strong coupling superconductivity in FeSexTe1−x

Cited by 152 publications

References 30 publications

Consequences of Broken Translational Symmetry inFeSexTe1−x

Consequences of Broken Translational Symmetry inFeSexTe1−x

Comparative Review on Thin Film Growth of Iron-Based Superconductors

Anomalous density of states in multiband superconductors near the Lifshitz transition

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