Electron-momentum dependence of electron-phonon coupling underlies dramatic phonon renormalization in YNi2B2C
Journal Article
·
· Nature Communications
- Karlsruhe Inst. of Technology (Germany); University of Colorado-Boulder
- Univ. de Fribourg (Switzerland)
- Univ. de Fribourg (Switzerland); Univ. Rennes (France)
- Karlsruhe Inst. of Technology (Germany)
- Karlsruhe Inst. of Technology (Germany); Lab. Léon Brillouin (CEA-CNRS), Gif-sur-Yvette (France)
- Inst. Laue-Langevin (France)
- Paul Scherrer Inst., Villigen (Switzerland)
- Univ. of Colorado, Boulder, CO (United States)
Electron-phonon coupling, i.e., the scattering of lattice vibrations by electrons and vice versa, is ubiquitous in solids and can lead to emergent ground states such as superconductivity and charge-density wave order. A broad spectral phonon line shape is often interpreted as a marker of strong electron-phonon coupling associated with Fermi surface nesting, i.e., parallel sections of the Fermi surface connected by the phonon momentum. Alternatively broad phonons are known to arise from strong atomic lattice anharmonicity. Here, we show that strong phonon broadening can occur in the absence of both Fermi surface nesting and lattice anharmonicity, if electron-phonon coupling is strongly enhanced for specific values of electron-momentum, k. We use inelastic neutron scattering, soft x-ray angle-resolved photoemission spectroscopy measurements and ab-initio lattice dynamical and electronic band structure calculations to demonstrate this scenario in the highly anisotropic tetragonal electron-phonon superconductor YNi2B2C. This new scenario likely applies to a wide range of compounds.
- Research Organization:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- Swiss National Science Foundation (SNSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Engineering & Technology. Office of Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) Programs
- Grant/Contract Number:
- SC0006939
- OSTI ID:
- 1903375
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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