Enhanced Electron-Phonon Coupling for Charge-Density-Wave Formation in La1.8-$$x$$Eu0.2Sr$$x$$CuO4+$$δ$$
- Univ. of Illinois, Urbana, IL (United States); Peking Univ., Beijing (China)
- Univ. of Illinois, Urbana, IL (United States)
- Univ. of Illinois, Urbana, IL (United States); Harvard Univ., Cambridge, MA (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Charge density wave (CDW) correlations are prevalent in all copper-oxide superconductors. While CDWs in conventional metals are driven by coupling between lattice vibrations and electrons, the role of the electron-phonon coupling (EPC) in cuprate CDWs is strongly debated. Using Cu L3 edge resonant inelastic x-ray scattering, we study the CDW and Cu-O bond-stretching phonons in the stripe-ordered cuprate La1.8-xEu0.2SrxCuO4+δ. In this work, we investigate the interplay between charge order and EPC as a function of doping and temperature and find that the EPC is enhanced in a narrow momentum region around the CDW ordering vector. By detuning the incident photon energy from the absorption resonance, we extract an EPC matrix element at the CDW ordering vector of M ≃ 0.36 eV , which decreases to M ≃ 0.30 eV at high temperature in the absence of the CDW. Our results suggest a feedback mechanism in which the CDW enhances the EPC which, in turn, further stabilizes the CDW.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation
- Grant/Contract Number:
- SC0012704; FG02-06ER46285; SC0012368; GBMF4542
- OSTI ID:
- 1661642
- Alternate ID(s):
- OSTI ID: 1958768
- Report Number(s):
- BNL-219830-2020-JAAM; TRN: US2203608
- Journal Information:
- Physical Review Letters, Vol. 125, Issue 9; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
charge density waves
electron-phonon coupling
electronic structure
impurities in superconductors
superconducting phase transition
cuprates
high-temperature superconductors
resonant inelastic x-ray scattering
Resonant inelastic x-ray scattering
electron-phonon interaction