Possible observation of the signature of the bad metal phase and its crossover to a Fermi liquid in κ-(BEDT-TTF) 2 Cu(NCS) 2 bulk and nanoparticles by Raman scattering

κ-(BEDT-TTF) Cu(NCS) has been investigated by Raman scattering in both bulk and nanoparticle compounds. Phonon modes from 20 to 1600 cm have been assigned. Focusing on the unexplored low frequency phonons, a plateau in frequencies is observed in the bulk phonons between 50 and 100 K and assigned to...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2021-01, Vol.33 (12), p.125403
Main Authors: Revelli Beaumont, M, Hemme, P, Gallais, Y, Sacuto, A, Jacob, K, Valade, L, de Caro, D, Faulmann, C, Cazayous, M
Format: Article
Language:English
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Summary:κ-(BEDT-TTF) Cu(NCS) has been investigated by Raman scattering in both bulk and nanoparticle compounds. Phonon modes from 20 to 1600 cm have been assigned. Focusing on the unexplored low frequency phonons, a plateau in frequencies is observed in the bulk phonons between 50 and 100 K and assigned to the signature of the bad metal phase. Nanoparticles of κ-(BEDT-TTF) Cu(NCS) exhibit anomalies at 50 K associated to the crossover from a bad metal to a Fermi liquid whose origins are discussed.
ISSN:1361-648X