Observation of Weak Kondo Effect and Angle Dependent Magnetoresistance in Layered Antiferromagnetic V$_5$S$_8$ Single Crystal

TL;DR

This study reports the observation of the weak Kondo effect and highly anisotropic angle-dependent magnetoresistance in layered antiferromagnetic V$_5$S$_8$ single crystals, revealing complex magnetic interactions and anisotropies below the Néel temperature.

Contribution

It demonstrates the presence of the Kondo effect in V$_5$S$_8$ due to antiferromagnetic interactions and uncovers significant magnetic anisotropy and angle-dependent magnetoresistance in this compound.

Findings

Kondo effect observed below 27 K in V$_5$S$_8$

Strong magnetic anisotropy below the Néel temperature

Out-of-plane spin-flop transition at 3.5 T

Abstract

The compound V$_5$S$_8$ can also be represented by V$_{1.25}$S$_2$, a transition metal dichalcogenide (TMDC) with excess V. Very few TMDCs show magnetism and/or Kondo effect. Among them, the sister compounds VSe$_2$ and VTe$_2$ are recently proved to show ferromagnetism in addition to the low-temperature resistivity upturn due to Kondo effect. In this study, we show Kondo effect in V$_5$S$_8$ originated from the antiferromagnetic exchange interactions among the intercalated V atoms below the N$\acute{e}$el ($T_N$) temperature of 27 K. We find isotropic magnetic properties above $T_N$, while a strong magnetic anisotropy is noticed below $T_N$. In addition, below $T_N$ we find an out-of-plane ($H\parallel c$) spin-flop transition triggered at a critical field of 3.5 T that is absent from the in-plane ($H\perp c$). Angle-dependent magnetoresistance is found to be highly anisotropic in the antiferromagnetic state.