Anomalous metallic state in quasi-two-dimensional BaNiS${}_2$

Abstract

We report on a systematic study of the thermodynamic, electronic and charge transport properties of high-quality single crystals of BaNiS${}_2$, the metallic end-member of the quasi-twodimensional BaCo${}_{1-x}$Ni${}_x$S${}_2$ system characterized by a metal-insulator transition at $x_{cr}=0.22$. Our analysis of magnetoresistivity and specific heat data consistently suggests a picture of compensated semimetal with two hole- and one electron-bands, where electron-phonon scattering dominates charge transport and the minority holes exhibit, below $\sim$100 K, a very large mobility, ${\mu }_h\sim$ 15000 cm${}^2$V${}^{-1}$s${}^{-1}$, which is explained by a Dirac-like band. Evidence of unconventional metallic properties is given by an intriguing crossover of the resistivity from a Bloch-Grüneisen regime to a linear$-T$ regime occurring at 2 K and by a strong linear term in the paramagnetic susceptibility above 100 K. We discuss the possibility that these anomalies reflect a departure from conventional Fermi-liquid properties in presence of short-range AF fluctuations and of a large Hund coupling.

21 pages 9 figures (colors)

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Cited by in corpus (8)

• Uncovering and tailoring hidden Rashba spin-orbit splitting in centrosymmetric crystals
• Probing the quantum phase transition in Mott insulator BaCoS_2 tuned by pressure and Ni-substitution
• Importance of non-local electron correlations in BaNiS${}_2$ semimetal from quantum oscillations studies
• Optical conductivity signatures of open Dirac nodal lines
• Extended Kohler's Rule of Magnetoresistance in TaCo${}_2$Te${}_2$
• Tuning Dirac nodes with correlated d-electrons in BaCo_{1-x}Ni_{x}S_{2}
• Correlation-driven electronic nematicity in the Dirac semimetal BaNiS2
• Dichroism in time-resolved ARPES and valence band orbital nature in BaNiS2