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Wang, D. M.; He, Jinjun; Xia, Tian‐Long; Chen, G. F.

doi:10.1103/physrevb.83.132502

Cited by 134 publications

(88 citation statements)

References 9 publications

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“…We seek for the commonality between the iron chalcogenides and pnictides based on the observation that the parent compound of the alkaline iron selenides are anti-ferromagnetic insulators 6,14 . These insulating selenides contain Fe vacancies that are ordered in the Fe-square lattice, so that the Fe valence is kept at þ 2.…”

Section: Resultsmentioning

confidence: 99%

Superconductivity at the border of electron localization and itinerancy

Goswami

et al. 2013

Nat Commun

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The superconducting state of iron pnictides and chalcogenides exists at the border of antiferromagnetic order. Consequently, these materials could provide clues about the relationship between magnetism and unconventional superconductivity. One explanation, motivated by the so-called bad metal behaviour of these materials proposes that magnetism and superconductivity develop out of quasi-localized magnetic moments that are generated by strong electron-electron correlations. Another suggests that these phenomena are the result of weakly interacting electron states that lie on nested Fermi surfaces. Here we address the issue by comparing the newly discovered alkaline iron selenide superconductors, which exhibit no Fermi-surface nesting, to their iron pnictide counterparts. We show that the strongcoupling approach leads to similar pairing amplitudes in these materials, despite their different Fermi surfaces. We also find that the pairing amplitudes are largest at the boundary between electronic localization and itinerancy, suggesting that new superconductors might be found in materials with similar characteristics.

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Section: Resultsmentioning

confidence: 99%

Superconductivity at the border of electron localization and itinerancy

Goswami

et al. 2013

Nat Commun

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“…3 and 4. However, the hump phenomenon has been found in other iron-selenide, K x Fe 2−y Se 2 , superconductors 40,41 , but it was not present in FeAs-based superconductors, where resistivity data for the pristine or doped compound exhibit a metallic behavior over the entire temperature range 42 . More interestingly, T c , T s and the maximum in dρ/dT are suppressed by increasing the Co or S-doping in FeSe.…”

Section: Structural Transitionmentioning

confidence: 95%

Impurity scattering effects on the superconducting properties and the tetragonal-to-orthorhombic phase transition in FeSe

Abdel-Hafiez

Brisbois

et al. 2016

Phys. Rev. B

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A comprehensive study of the doping dependence phase diagram of FeSe-based superconductors is still required due to the lack of a clean and systematic means of doping control. Here, we report on the magneto-optical imaging, thermodynamic and transport properties, as well as in-situ angleresolved photoemission spectroscopy (ARPES) studies, on the impurity scattering in stoichiometric FeSe single crystals. Co doping at the Fe site, is found to decrease the superconducting transition temperature (Tc). The upper critical field and specific heat all indicate a possible multiband with strong coupling superconductivity in the Co-doped system. A remarkable feature in FeSe is that its temperature dependent resistivity exhibits a wide hump at high temperatures, signature of a crossover from a semiconducting-like behavior to metallic behavior. ARPES data between 180 K and 282 K indicates the existence of chemical potential shift with increasing thermal excitations, resulting in a change of the Fermi surface topology and exhibiting a semi-metal behavior. We found that the temperature induced-Lifshitz transition is much higher than the temperature for the nematic order. A structural tetragonal-to-orthorhombic phase transition (Ts) (consequence of the electronic nematicity) is suppressed by either physical or chemical pressures. Due to the reconstruction of the Fermi surface at Ts, specific heat anomalies at Ts present ∆Cp/Ts ≈ γn, the Sommerfield coefficient at low temperature. This reflects additional electronic instability in the FeSe1−xSx system.

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“…A x Fe 2−y Se 2 (A = K, Rb, and Cs) Precursor A x Fe 2−y Se 2 (A = K, Rb, and Cs) single crystals used as precursors can be obtained using self-flux, Bridgman, and optical floating-zone (OFZ) crystal growth methods [54][55][56][57][58][59][60][61][62][63]. Figure 1a,b show the schematic illustrations of the self-flux and Bridgman growth methods, respectively.…”

Section: Crystal Growthmentioning

confidence: 99%

(Li1−xFex)OHFeSe Superconductors: Crystal Growth, Structure, and Electromagnetic Properties

2017

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This review focuses on the growth of high-quality (Li 1−x Fe x )OHFeSe single crystals by a hydrothermal method using floating-zone-grown A x Fe 2−y Se 2 (A = K, Rb, and Cs) as precursors. The structure, superconductivity, and magnetic behavior of the obtained crystals are highly influenced by the growth conditions, such as time, temperature, and composition. A phase diagram with temperature against the c-lattice constant is summarized including the antiferromagnetic spin density wave, superconducting, and paramagnetic phases.

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Effect of varying iron content on the transport properties of the potassium-intercalated iron selenideKxFe2−y

Cited by 134 publications

References 9 publications

Superconductivity at the border of electron localization and itinerancy

Superconductivity at the border of electron localization and itinerancy

Impurity scattering effects on the superconducting properties and the tetragonal-to-orthorhombic phase transition in FeSe

(Li1−xFex)OHFeSe Superconductors: Crystal Growth, Structure, and Electromagnetic Properties

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