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Ambolode, L. C. C.; Okazaki, Kozo; Horio, M.; Suzuki, H.; Liu, L.; Ideta, S.; Yoshida, T.; Mikami, Taisei; Kakeshita, T.; Uchida, S.; Ono, Kanta; Kumigashira, Hiroshi; Hashimoto, M.; Lü, Donghui; Shen, Zhi‐Xun; Fujimori, A.

doi:10.1103/physrevb.92.035104

Cited by 11 publications

(5 citation statements)

References 24 publications

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“…1). This observation is consistent with the ARPES reports on similar compounds [38,39,[41][42][43]. Effective mass enhancements are estimated for this compound upon employing parabolic fits (see Fig.…”

Section: Discussionsupporting

confidence: 79%

“…Here we can notice that the mass renormalization factors are relatively smaller at the Z point compared to the point for the bands α 1 , α 2 and β, which further suggests k z -dependent correlations in these compounds. On the whole, our findings on the band dependent mass renormalization factors ranging from 1.7-5 observed in the -M plane are in very good agreement with previous reports [39][40][41][42][43]59,60], while contradicting to the mass renormalization factor of 17 reported in Ref. [38].…”

Section: Discussionsupporting

confidence: 76%

“…We could resolve three hole pockets near the zone center and an electron pocket near the zone corner in the case of FeTe 0.5 Se 0.5 , consistent with the band structure of the similar compounds [38][39][40][41][42][43], whereas only two hole pockets are resolved near the center and an electron pocket is resolved near the corner of the Brillouin zone in the case of Fe 0.9 Ni 0.1 Te 0.5 Se 0.5 , suggesting that the hole pocket that has predominantly xy orbital character is very sensitive to impurity scattering. We observe a decrease in the size of the hole pockets and an increase in the size of the electron pockets with Ni substitution, suggesting an effective electron doping.…”

Section: Introductionsupporting

confidence: 52%

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Effect of impurity substitution on band structure and mass renormalization of the correlatedFeTe0.5Se0.5superconductor

et al. 2016

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Using angle-resolved photoemission spectroscopy (ARPES), we studied the effect of the impurity potential on the electronic structure of FeTe 0.5 Se 0.5 superconductor by substituting 10% of Ni for Fe, which leads to an electron doping of the system. We could resolve three hole pockets near the zone center and an electron pocket near the zone corner in the case of FeTe 0.5 Se 0.5 , whereas only two hole pockets near the zone center and an electron pocket near the zone corner are resolved in the case of Fe 0.9 Ni 0.1 Te 0.5 Se 0.5 , suggesting that the hole pocket having predominantly the xy orbital character is very sensitive to the impurity scattering. Upon electron doping, the size of the hole pockets decreases and the size of the electron pockets increases as compared to the host compound. However, the observed changes in the size of the electron and hole pockets are not consistent with the rigid-band model. Moreover, the effective mass of the hole pockets is reduced near the zone center and of the electron pockets is increased near the zone corner in the doped Fe 0.9 Ni 0.1 Te 0.5 Se 0.5 as compared to FeTe 0.5 Se 0.5 . We refer these observations to the changes of the spectral function due to the effect of the impurity potential of the dopants.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionsupporting

confidence: 76%

Section: Introductionsupporting

confidence: 52%

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Effect of impurity substitution on band structure and mass renormalization of the correlatedFeTe0.5Se0.5superconductor

et al. 2016

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“…This indicates that the charge transfer in this heterostructure is robust, regardless of the Se concentration. We note that the coherence of the spectrum degrades upon Te substitution, which may be due to enhanced electron correlations [20,21] or antiferromagnetic fluctuations [22]. Strong intensity appears at the BZ center as the Se decreases.…”

mentioning

confidence: 85%

FeTe1−Se monolayer films: towards the realization of high-temperature connate topological superconductivity

et al. 2017

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† These authors contributed equally to this work [Abstract] We performed angle-resolved photoemission spectroscopy studies on a series of FeTe 1-x Se x monolayer films grown on SrTiO 3 . The superconductivity of the films is robust and rather insensitive to the variations of the band position and effective mass caused by the substitution of Se by Te. However, the band gap between the electron-and hole-like bands at the Brillouin zone center decreases towards band inversion and parity exchange, which drive the system to a nontrivial topological state predicted by theoretical calculations. Our results provide a clear experimental indication that the FeTe 1-x Se x monolayer materials are high-temperature connate topological superconductors in which band topology and superconductivity are integrated intrinsically.

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“…Recently, the topological band structure of iron-based superconductors has aroused a great deal of attention. The FeSe 1−x Te x family with a wide range of composition x is of particular interest [15,16,[40][41][42][43][44][45][46][47]. Recent evidence shows that FeSe 0.45 Te 0.55 is a strong topological insulator exhibiting a single Dirac cone on the (001) surface [48].…”

mentioning

confidence: 99%

Pairing symmetry and topological surface state in iron-chalcogenide superconductors

Hu,

Johnson,

2019

Preprint

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The symmetries of superconducting gap functions remain an important question of iron-based superconductivity. Motivated by the recent angle-resolved photoemission spectroscopic measurements on iron-chalcogenide superconductors, we investigate the influence of pairing symmetries on the topological surface state. If the surface Dirac cone becomes gapped in the superconducting phase, it implies magnetization induced from time-reversal symmetry breaking pairing via spinorbit coupling. Based on the crystalline symmetry constraints on the Ginzburg-Landau free energy, the gap function symmetries are among the possibilities of A 1g(u) ± iA 2g(u) , B 1g(u) ± iB 2g(u) , or, E g(u) ± iE g(u) . This time-reversal symmetry breaking effect can exist in the normal state very close to Tc with the relative phase between two gap functions locked at ± π 2 . The coupling between magnetization and superconducting gap functions is calculated based on a three-orbital model for the band structure of iron-chalcogenides. This study provides the connection between the gap function symmetries and topological properties of the surface state.

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Dependence of electron correlation strength inFe1+yTe1−x

Cited by 11 publications

References 24 publications

Effect of impurity substitution on band structure and mass renormalization of the correlatedFeTe0.5Se0.5superconductor

Effect of impurity substitution on band structure and mass renormalization of the correlatedFeTe0.5Se0.5superconductor

FeTe1−Se monolayer films: towards the realization of high-temperature connate topological superconductivity

Pairing symmetry and topological surface state in iron-chalcogenide superconductors

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