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  Evidence of a coupled electron-phonon liquid in NbGe2

Yang, H.-Y., Yao, X., Plisson, V., Mozaffari, S., Scheifers, J. P., Savvidou, A. F., et al. (2021). Evidence of a coupled electron-phonon liquid in NbGe2. Nature Communications, 12(1): 5292. doi:10.1038/s41467-021-25547-x.

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https://doi.org/10.1038/s41467-021-25547-x (Verlagsversion)
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 Urheber:
Yang, Hung-Yu1, Autor
Yao, Xiaohan1, Autor
Plisson, Vincent1, Autor
Mozaffari, Shirin1, Autor
Scheifers, Jan P.1, Autor
Savvidou, Aikaterini Flessa1, Autor
Choi, Eun Sang1, Autor
McCandless, Gregory T.1, Autor
Padlewski, Mathieu F.1, Autor
Putzke, Carsten1, Autor
Moll, Philip J. W.1, Autor
Chan, Julia Y.1, Autor
Balicas, Luis1, Autor
Burch, Kenneth S.1, Autor
Tafti, Fazel1, Autor
Affiliations:
1external, ou_persistent22              

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 Zusammenfassung: Whereas electron-phonon scattering relaxes the electron’s momentum in metals, a perpetual exchange of momentum between phonons and electrons may conserve total momentum and lead to a coupled electron-phonon liquid. Such a phase of matter could be a platform for observing electron hydrodynamics. Here we present evidence of an electron-phonon liquid in the transition metal ditetrelide, NbGe2, from three different experiments. First, quantum oscillations reveal an enhanced quasiparticle mass, which is unexpected in NbGe2 with weak electron-electron correlations, hence pointing at electron-phonon interactions. Second, resistivity measurements exhibit a discrepancy between the experimental data and standard Fermi liquid calculations. Third, Raman scattering shows anomalous temperature dependences of the phonon linewidths that fit an empirical model based on phonon-electron coupling. We discuss structural factors, such as chiral symmetry, short metallic bonds, and a low-symmetry coordination environment as potential design principles for materials with coupled electron-phonon liquid.

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Sprache(n): eng - English
 Datum: 2021
 Publikationsstatus: Online veröffentlicht
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1038/s41467-021-25547-x
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Titel: Nature Communications
  Kurztitel : Nat. Commun.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Nature Publishing Group
Seiten: - Band / Heft: 12 (1) Artikelnummer: 5292 Start- / Endseite: - Identifikator: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723