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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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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-75D4-2 Version Permalink: https://hdl.handle.net/21.11116/0000-000B-75D5-1
Genre: Journal Article

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

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 Abstract: 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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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41467-021-25547-x
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 12 (1) Sequence Number: 5292 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723