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Electron-momentum dependence of electron-phonon coupling underlies dramatic phonon renormalization in YNi$_{2}$B$_{2}$C

Kurzhals, Philipp; Kremer, Geoffroy; Jaouen, Thomas; Nicholson, Christopher W.; Heid, Rolf; Nagel, Peter; Castellan, John-Paul; Ivanov, Alexandre; Muntwiler, Matthias; Rumo, Maxime; Salzmann, Bjoern; Strocov, Vladimir N.; Reznik, Dmitry; Monney, Claude; Weber, Frank ORCID iD icon

Abstract (englisch):

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.


Verlagsausgabe §
DOI: 10.5445/IR/1000141838
Veröffentlicht am 13.01.2022
Originalveröffentlichung
DOI: 10.1038/s41467-021-27843-y
Scopus
Zitationen: 3
Web of Science
Zitationen: 3
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für QuantenMaterialien und Technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000141838
HGF-Programm 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena
Erschienen in Nature Communications
Verlag Nature Research
Band 13
Heft 1
Seiten Art.-Nr.: 228
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 11.01.2022
Nachgewiesen in Web of Science
Dimensions
Scopus
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