Evidence of a coupled electron-phonon liquid in NbGe2

Medientyp: E-Artikel
Titel: Evidence of a coupled electron-phonon liquid in NbGe2
Beteiligte: Yang, Hung-Yu; Yao, Xiaohan; Plisson, Vincent; Mozaffari, Shirin; Scheifers, Jan P.; Savvidou, Aikaterini Flessa; Choi, Eun Sang; McCandless, Gregory T.; Padlewski, Mathieu F.; Putzke, Carsten; Moll, Philip J. W.; Chan, Julia Y.; Balicas, Luis; Burch, Kenneth S.; Tafti, Fazel
Erschienen: Springer Science and Business Media LLC, 2021
Erschienen in: Nature Communications
Sprache: Englisch
DOI: 10.1038/s41467-021-25547-x
ISSN: 2041-1723
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Beschreibung: <jats:title>Abstract</jats:title><jats:p>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, NbGe<jats:sub>2</jats:sub>, from three different experiments. First, quantum oscillations reveal an enhanced quasiparticle mass, which is unexpected in NbGe<jats:sub>2</jats:sub> 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.</jats:p>
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