Low-energy (< 10 meV) feature in the nodal electron self-energy and strong temperature dependence of the Fermi velocity in Bi(2)Sr(2)CaCu(2)O(8+delta)

Abstract

Using low-photon energy angle-resolved photoemission (ARPES), we study the low-energy dispersion along the nodal (pi, pi) direction in Bi(2)Sr(2)CaCu(2)O(8+delta) (Bi2212) as a function of temperature. Less than 10 meV below the Fermi energy, the high-resolution data reveals a novel "kink"-like feature in the real part of 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 as the temperature is raised. A corollary of this finding is that the Fermi velocity, as measured over this energy range, varies rapidly with temperature - increasing by almost 30% from 70 to 110 K.

5 pages, 3 figures, citation added, submitted to Phys. Rev. Lett

References in corpus (9)

• Laser ARPES, the sudden approximation, and quasiparticle-like peaks in Bi2Sr2CaCu2O8+delta
• Doping-dependent nodal Fermi velocity in Bi-2212 revealed by high-resolution ARPES
• An Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates
• Identification of a New Form of Electron Coupling in Bi2Sr2CaCu2O8 Superconductor by Laser-Based Angle-Resolved Photoemission
• Experimental setup for low-energy laser-based angle resolved photoemission spectroscopy
• Unmasking the nodal quasiparticle dynamics in cuprate superconductors using low-energy photoemission
• Correction of non-linearity effects in detectors for electron spectroscopy
• Coupling of Low Energy Electrons in Optimally Doped Bi2212 to an Optical Phonon Mode
• Doping-dependence of nodal quasiparticle properties in high-$T_{\mathrm{c}}$ cuprates studied by laser-excited angle-resolved photoemission spectroscopy

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