Low-energy phonons in and their possible interaction with electrons measured by inelastic neutron scattering
- Univ. of Colorado, Boulder, CO (United States)
- Karlsruhe Inst. of Technology (KIT) (Germany)
- Max-Planck-Institut fur Festkorperphysik, Stuttgart (Germany); Max Planck Society Outstation, Garching (Germany)
- Incheon National Lab. (Korea, Republic of)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
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 Bi2Sr2CaCu2O8+δ 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 reported low energy phonon spectral weight half-way to the zone boundary is consistent with conventional lattice dynamics and does not reflect incipient charge density wave (CDW).
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; SC0006939
- OSTI ID:
- 1573475
- Alternate ID(s):
- OSTI ID: 1842499; OSTI ID: 1842500
- Report Number(s):
- BNL-212304-2019-JAAM; PRBMDO; TRN: US2100051
- Journal Information:
- Physical Review B, Vol. 100, Issue 14; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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