Quantum Linear Magnetoresistance and Fermi Liquid Behavior in Kagome Metal Ni3In2S2

TL;DR

This study investigates the electronic and magnetic properties of Ni3In2S2, a Kagome metal with Dirac nodal line features, revealing strong electron correlations, extended Fermi liquid behavior, and topological characteristics through comprehensive experimental analysis.

Contribution

It provides the first detailed characterization of Ni3In2S2 as a Dirac nodal line Kagome metal with evidence of strong correlations and topological features, expanding understanding of Kagome materials.

Findings

Fermi liquid behavior observed up to 82 K due to strong correlations

High Kadowaki-Woods ratio indicating strong electron-electron interactions

Topological features evidenced by de-Haas van Alphen oscillations

Abstract

Kagome metals gain attention as they manifest a spectrum of quantum phenomena, including superconductivity, charge order, frustrated magnetism, and intertwined correlated states of condensed matter. With regard to electronic band structure, several of the them exhibit non-trivial topological characteristics. Here, we present a thorough investigation on the growth and the physical properties of single crystals of Ni3In2S2 which is established to be a Dirac nodal line Kagome metal. Extensive characterization is attained through temperature and field-dependent resistivity, angle-dependent magnetoresistance and specific heat measurements. In most metals, the Fermi liquid behaviour is mostly restricted to a narrow range of temperature. In Ni3In2S2, this characteristic feature has been observed for an extensive temperature range of 82 K. This is attributed to the strong electron-electron correlation in the material. Specific heat measurements reveal a high Kadowaki-Woods ratio which is in good agreement with strongly correlated systems. Almost linear positive magnetoresistance follows the conventional Kohler scaling which depicts the applicability of semi-classical theories. The angle-dependent magneto-resistance been explained using the Voigt-Thomson formula. Furthermore, de-Haas van Alphen oscillations are observed in magnetization vs. magnetic field measurement which shed light on the topological features in the Shandite Ni3In2S2.