Unusual Doping Dependence of the Electronic Structure and Coexistence of Spin-Density-Wave and Superconductor Phases in Single Crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="bold">K</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></m

Zhang, Y.; Jia, Wei; Ou, H. W.; Zhao, Jun; Zhou, Bo; Chen, F.; Xu, Min; He, Chi; Wu, Gang; Chen, Hanjie; Arita, Masashi; Shimada, Kenya; Namatame, H.; Takeuchi, Masaki; Chen, X. H.; Feng, D. L.

doi:10.1103/physrevlett.102.127003

Cited by 65 publications

(43 citation statements)

References 22 publications

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“…Below we present results for ∆ = 50 meV, which is in rough agreement with the estimates of AFM band splitting from ARPES data [33,34] and neutron scattering [35] (varying in the interval 50-100 meV), correlation length of AFM fluctuations ξ = 10a (a -lattice spacing), also in rough agrrement with netron scattering data [23,24]. In the following, all momenta are given in units of inverse lattice spacing, energies in eV.…”

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Electronic structure and possible pseudogap behavior in iron based superconductors

Kuchinskiǐ

Sadovskiǐ

2010

Jetp Lett.

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Starting from the simplified analytic model of electronic spectrum of iron -pnictogen (chalcogen) hightemperature superconductors close to the Fermi level, we discuss the influence of antiferromagneting (AFM) scattering both for stoichiometric case and the region of possible short -range order AFM fluctuations in doped compounds. Qualitative picture of the evolution of electronic spectrum and Fermi surfaces (FS) for different dopings is presented, with the aim of comparison with existing and future ARPES experiments. Both electron and hole dopings are considered and possible pseudogap behavior connected with partial FS "destruction" is demonstrated, explaining some recent experiments. PACS: 71.10. Hf, 71.18.+y, 74.25.Jb, Recent discovery of the new class of iron based hightemperature superconductors [1] stimulated intensive of experimental and theoretical efforts to understand its properties (see for the review Refs. [2,3]). Despite already the immense progress in understanding of these systems, the nature of superconducting pairing and anomalies in the normal state are still under debate.Clarification of the structure of electronic spectrum of new superconductors is crucial for explanation of their physical properties. Accordingly, since the first days, different groups have started the detailed band -structure calculations for all classes of these compounds, based primarily on different realizations of general LDA approach. These calculations were primarily performed for paramagnetic tetragonal FeAs 1111 systems [4,5,6,7], for 122 [8,9,10], for 111 [10,11,12] and α-FeSe [13], followed by many similar works by other authors. In fact, all these calculations demonstrated almost universal LDA band structure in relatively narrow energy interval (±0.1eV ) around the Fermi level, which is of relevance to superconductivity [2].In this energy interval the electronic spectrum can be modelled analytically as follows. Three "hole-like" branches of the spectrum crossing the Fermi level near the Γ point in the Brillouin zone (cf. Fig.1a) can be taken isotropic and modelled by quadratic dispersion:1) E-mail: sadovski@iep.uran.ru where m i , ε i (i = 1, 2, 3) can be easily determined from LDA calculations (e.g. for 122 system from the results of Ref.[8]). Two "electron-like" branches of the spectrum crossing the Fermi level near M(π, π) point of the reduced Brillouin zone are anisotropic and produce two elliptic isoenergetic crossections at the Fermi level (cf. Fig.1b), one of which is extened in the direction MΓ, with the second one extended in the orthogonal direction. Let us count the momentum from the M point (i.e. replace p − Q → p) and take one momentum p axis along MΓ direction and other orthogonal to it (Fig.1b). The relevant momentum projections p 1 and p 2 are connected with the usual x, y projections as. Consider one of the ellipses, e.g. those extended along the direction orthogonal to MΓ direction. Electron dispersion along MΓ can be modelled by quadratic law ε p1 (p) = p 2 2m4 − ε 4 . Dispersion along the orthog...

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confidence: 69%

Electronic structure and possible pseudogap behavior in iron based superconductors

Kuchinskiǐ

Sadovskiǐ

2010

Jetp Lett.

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“…Moreover, no energy gap related to Fermi surface nesting was observed, similar to the case of the 122, 111, and 11 series. [16][17][18][19]24,33 …”

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“…As a result, the nature of the SDW state is exposed by the bulk band reconstruction at low temperatures. Similar to BaFe 2 As 2 and other members in the so called 122 series, [16][17][18][19] no energy gap related to nesting is observed at the Fermi surfaces of LaFeAsO. Instead, a band at high binding energies shifts down as much as 25 meV, starting from the structural transition temperature and going through the SDW transition smoothly.…”

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confidence: 95%

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Surface and bulk electronic structures of LaFeAsO studied by angle-resolved photoemission spectroscopy

et al. 2010

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The electronic structure of LaFeAsO, a parent compound of iron-arsenic superconductors, is studied by angle-resolved photoemission spectroscopy. By examining its dependence on photon energy, polarization, and sodium dosing, both the bulk and the surface contributions are identified. We find that a bulk band moves toward high binding energies below the structural transition temperature, and shifts smoothly across the spin-density-wave transition by about 25 meV. Our data suggest that the band reconstruction may play a crucial role in the spin-density-wave and the structural transitions. For the surface states, both the LaO-terminated and FeAs-terminated components are revealed. Certain small band shifts are observed for the FeAs-terminated surface states in the spin-density-wave state, which might be a reflection of the bulk electronic-structure reconstruction. Moreover, sharp quasiparticle peaks quickly rise at low temperatures, indicating drastic reduction in the scattering rate. A kink structure in one of the surface band is shown to be possibly related to the enhanced electron-phonon interactions on the polar surface.

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“…The insulating parental phase even exhibits certain Mott-insulator signatures, and it is phase separated from the superconducting phase in the K x Fe 2−y Se 2 superconductor at a mesoscopic scale [7,10]. Moreover, angle-resolved photoemission spectroscopy (ARPES) studies have shown that its Fermi surface is consisted of electron pockets only [7,11,12], which is again distinct from most of the iron-based superconductors [13][14][15][16][17]. These unique properties of K x Fe 2−y Se 2 have raised a lot of interest.…”

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The orbital characters of low-energy electronic structure in iron-chalcogenide superconductor K x Fe2−y Se2

Chen

et al. 2012

Chin. Sci. Bull.

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Unusual Doping Dependence of the Electronic Structure and Coexistence of Spin-Density-Wave and Superconductor Phases in Single CrystallineSr1−xKxFe2As2

Cited by 65 publications

References 22 publications

Electronic structure and possible pseudogap behavior in iron based superconductors

Electronic structure and possible pseudogap behavior in iron based superconductors

Surface and bulk electronic structures of LaFeAsO studied by angle-resolved photoemission spectroscopy

The orbital characters of low-energy electronic structure in iron-chalcogenide superconductor K x Fe2−y Se2

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