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- W2922776756 abstract "The high Tc superconductor FeTe0.55Se0.45 has recently been shown to support a surface state with topological character. Here we use low-energy laser-based ARPES with variable light polarization, including both linear and circular polarization, to re-examine the same material and the related FeTe0.7Se0.3, with larger Te concentration. In both cases we observe the presence of a surface state displaying linear dispersion in a cone-like configuration. The use of circular polarization confirms the presence of helical spin structure. These experimental studies are compared with theoretical studies that account for the local magnetic effects related to the paramagnetism observed in this system in the normal state. In contrast to previous studies we find that including the magnetic contributions is necessary to bring the chemical potential of the calculated electronic band structure naturally into alignment with the experimental observations." @default.
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- W2922776756 date "2019-05-13" @default.
- W2922776756 modified "2023-10-18" @default.
- W2922776756 title "Interplay of paramagnetism and topology in the Fe-chalcogenide high- <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math> superconductors" @default.
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- W2922776756 doi "https://doi.org/10.1103/physrevb.99.205117" @default.
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