AI Article Synopsis
- High-resolution laser-based measurements were conducted on Bi2212 superconductors to explore how electrons couple with collective excitations over different momentum spaces.
- Two distinct energy scales were identified in the superconducting state: one maintains a consistent energy of around 78 meV, while the other varies from about 40 meV to 70 meV depending on the region.
- These findings suggest a complex interaction between electrons and modes in Bi2212 that challenges existing theories about electron-mode coupling and its significance in high-temperature superconductivity in cuprates.
Article Abstract
High-resolution laser-based angle-resolved photoemission measurements have been carried out on Bi2Sr2CaCu2O(8+δ) (Bi2212) superconductors to investigate momentum dependence of electron coupling with collective excitations (modes). 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. These two energy scales exhibit distinct momentum dependence: one keeps its energy near 78 meV over a large momentum space while the other changes its energy from ∼40 meV near the antinodal region to ∼70 meV near the nodal region. These observations provide a new picture on momentum evolution of electron-boson coupling in Bi2212 that electrons are coupled with two sharp modes simultaneously over a large momentum space in the superconducting states. Their unusual momentum dependence 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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| http://dx.doi.org/10.1103/PhysRevLett.111.107005 | DOI Listing |
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