期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.046402
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资金
- DOE [DE-FG02-03ER46066]
- NSF EUV ERC
- KAKENHI [19340105]
- Grants-in-Aid for Scientific Research [19340105] Funding Source: KAKEN
- U.S. Department of Energy (DOE) [DE-FG02-03ER46066] Funding Source: U.S. Department of Energy (DOE)
Using low photon energy angle-resolved photoemission, we study the low-energy dispersion along the nodal (pi, pi) direction in Bi2Sr2CaCu2O8+delta as a function of temperature. Less than 10 meV below the Fermi energy, the high-resolution data reveal a novel kinklike feature in the electron self-energy that is distinct from the larger well-known kink roughly 70 meV below E-F. This new kink is strongest below the superconducting critical temperature and weakens substantially at higher temperatures. A corollary of this finding is that the Fermi velocity nu(F), as measured in this low-energy range, varies rapidly with temperature-increasing by almost 30% from 70 to 110 K. The behavior of v(F)(T) appears to shift as a function of doping, suggesting a departure from simple universality in the nodal Fermi velocity of cuprates.
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