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Title: Low-energy phonons in Bi 2 Sr 2 CaCu 2 O 8 + δ 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 2Sr 2CaCu 2O 8+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).

Authors:
 [1];  [2];  [3];  [4];  [5]; ORCiD logo [6];  [1]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Karlsruhe Inst. of Technology (KIT) (Germany)
  3. Max-Planck-Institut fur Festkorperphysik, Stuttgart (Germany); Max Planck Society Outstation, Garching (Germany)
  4. Incheon National Lab. (Korea, Republic of)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1573475
Report Number(s):
BNL-212304-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Merritt, A. M., Castellan, J. -P., Keller, T., Park, S. R., Fernandez-Baca, J. A., Gu, G. D., and Reznik, D. Low-energy phonons in Bi2Sr2CaCu2O8+δ and their possible interaction with electrons measured by inelastic neutron scattering. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.144502.
Merritt, A. M., Castellan, J. -P., Keller, T., Park, S. R., Fernandez-Baca, J. A., Gu, G. D., & Reznik, D. Low-energy phonons in Bi2Sr2CaCu2O8+δ and their possible interaction with electrons measured by inelastic neutron scattering. United States. doi:10.1103/PhysRevB.100.144502.
Merritt, A. M., Castellan, J. -P., Keller, T., Park, S. R., Fernandez-Baca, J. A., Gu, G. D., and Reznik, D. Fri . "Low-energy phonons in Bi2Sr2CaCu2O8+δ and their possible interaction with electrons measured by inelastic neutron scattering". United States. doi:10.1103/PhysRevB.100.144502. https://www.osti.gov/servlets/purl/1573475.
@article{osti_1573475,
title = {Low-energy phonons in Bi2Sr2CaCu2O8+δ and their possible interaction with electrons measured by inelastic neutron scattering},
author = {Merritt, A. M. and Castellan, J. -P. and Keller, T. and Park, S. R. and Fernandez-Baca, J. A. and Gu, G. D. and Reznik, D.},
abstractNote = {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).},
doi = {10.1103/PhysRevB.100.144502},
journal = {Physical Review B},
issn = {2469-9950},
number = 14,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

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