Low-energy phonons in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ and their possible interaction with electrons measured by inelastic neutron scattering

Abstract

Electron-phonon interaction in copper oxide superconductors is still enigmatic. Strong coupling for certain optic phonons is now well established experimentally, but theoretical understanding is challenging. Scattering of electrons near the Fermi surface by the longitudinal acoustic (LA) phonons is expected from basic theory because these phonons modulate electron density. We used inelastic neutron scattering on a large single crystal sample of optimally-doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ to show that low-energy LA phonons could couple to electronic density fluctuations only at small phonon wavevectors, which naturally limits any interaction to forward scattering. Such scattering should not be pairbreaking in the case of the d-wave gap. We also found that previously the reported low energy phonon spectral weight half-way to the zone boundary is consistent with conventional lattice dynamics and does not reflect an incipient charge density wave.

Updated Oct. 2019 to include new measurements and additional discussion. 7 pages, 4 figures, Supplementary included: 6 pages, 5 figures

References in corpus (7)

• Ubiquitous Interplay between Charge Ordering and High-Temperature Superconductivity in Cuprates
• Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ
• Photoemission kinks and phonons in cuprates
• Large Bi-2212 single crystal growth by the floating-zone technique
• Evidence for a charge collective mode associated with superconductivity in copper oxides from neutron and x-ray scattering measurements of La${}_{2-x}$Sr${}_x$CuO${}_4$
• Persistent low-energy phonon broadening near the charge order $q$-vector in bilayer cuprate Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Coupling of Low Energy Electrons in Optimally Doped Bi2212 to an Optical Phonon Mode

Cited by in corpus (6)

• Charge ordering in superconducting copper oxides
• Anomalous doping evolution of nodal dispersion revealed by in-situ ARPES on continuously doped cuprates
• Long-wavelength phonon dynamics in incommensurate Bi2Sr2CaCu2O(8+delta) crystals by Brillouin light scattering spectroscopy
• The Future of the Correlated Electron Problem
• Optical Constants of Crystalline Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ by Brillouin Light Scattering Spectroscopy
• Tuning superconductivity and charge density wave order by next-nearest-neighbor hopping integral in honeycomb Holstein model