Evidence of a coupled electron-phonon liquid in NbGe2

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

doi:10.1038/s41467-021-25547-x

Title: Evidence of a coupled electron-phonon liquid in NbGe₂

Journal Article · 05 September 2021 · Nature Communications

DOI: https://doi.org/10.1038/s41467-021-25547-x · OSTI ID:1820916

^[1]; Yao, Xiaohan ^[2]; Plisson, Vincent ^[2]; Mozaffari, Shirin ^[3];

^[4]; Savvidou, Aikaterini Flessa ^[3]; Choi, Eun Sang ^[3]; McCandless, Gregory T. ^[4]; Padlewski, Mathieu F. ^[5];

^[5];

^[4];

^[3];

^[2];

^[2]

Boston College, Chestnut Hill, MA (United States); Florida State Unviersity
Boston College, Chestnut Hill, MA (United States)
Florida State Univ., Tallahassee, FL (United States)
Univ. of Texas at Dallas, Richardson, TX (United States)
École Polytechnique Fédérale de Lausanne (EPFL) (Switzerland)

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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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0002613

OSTI ID:: 1820916

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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