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Coexistence of Two Sharp-Mode Couplings in Bi\(_2\)Sr\(_2\)CaCu\(_2\)O\(_8\) \(_+\) \(_\delta \)

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Angle-Resolved Photoemission Spectroscopy on High-Temperature Superconductors

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Abstract

By using the vacuum ultraviolet laser-based ARPES system, we have performed high-resolution angle-resolved photoemission measurements on Bi\(_2\)Sr\(_2\)CaCu\(_2\)O\(_8\) \(_+\) \(_\delta \) (Bi2212) superconductors to investigate momentum dependence of electron coupling with collective excitations. Two coexisting energy scales are clearly revealed over a large momentum space for the first time in the superconducting state of the overdoped Bi2212 superconductor. Distinct momentum dependence has been identified for these two energy scales: One keeps its energy near 78 meV over a large momentum space while the other changes its energy from \(\sim \)40 meV near the antinodal region to \(\sim \)70 meV near the nodal region. These observations clearly indicate that electrons are coupled with two sharp modes simultaneously over a large momentum space in the superconducting states which naturally explains the relationship between the nodal and the antinodal kinks. The unusual momentum dependence of the two modes also poses a challenge to our current understanding of electron–mode coupling and its role for high-temperature superconductivity in cuprate superconductors.

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Correspondence to Junfeng He .

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He, J. (2016). Coexistence of Two Sharp-Mode Couplings in Bi\(_2\)Sr\(_2\)CaCu\(_2\)O\(_8\) \(_+\) \(_\delta \) . In: Angle-Resolved Photoemission Spectroscopy on High-Temperature Superconductors. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-52732-0_4

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  • DOI: https://doi.org/10.1007/978-3-662-52732-0_4

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