Electron-momentum dependence of electron-phonon coupling underlies dramatic phonon renormalization in YNi2B2C

Philipp Kurzhals, Geoffroy Kremer, Thomas Jaouen, Christopher W. Nicholson, Rolf Heid, Peter Nagel, John-Paul Castellan, Alexandre Ivanov, Matthias Muntwiler, Maxime Rumo, Bjoern Salzmann, Vladimir N. Strocov, Dmitry Reznik, Claude Monney and Frank Weber ()
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Philipp Kurzhals: Karlsruhe Institute of Technology
Geoffroy Kremer: Université de Fribourg
Thomas Jaouen: Université de Fribourg
Christopher W. Nicholson: Université de Fribourg
Rolf Heid: Karlsruhe Institute of Technology
Peter Nagel: Karlsruhe Institute of Technology
John-Paul Castellan: Karlsruhe Institute of Technology
Alexandre Ivanov: Institut Laue-Langevin
Matthias Muntwiler: Swiss Light Source
Maxime Rumo: Université de Fribourg
Bjoern Salzmann: Université de Fribourg
Vladimir N. Strocov: Swiss Light Source
Dmitry Reznik: University of Colorado at Boulder
Claude Monney: Université de Fribourg
Frank Weber: Karlsruhe Institute of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract 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.

Date: 2022
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DOI: 10.1038/s41467-021-27843-y

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