Anomalous resistivity upturn in Co intercalated TaS$_2$

TL;DR

This study investigates the anomalous low-temperature resistivity upturn in Co-intercalated TaS₂, revealing a non-Fermi liquid behavior consistent with the orbital two-channel Kondo effect, persisting even under high magnetic fields.

Contribution

It provides evidence of the orbital two-channel Kondo effect in Co₀.₂₈TaS₂ through detailed transport measurements and analysis of its resistivity behavior.

Findings

Resistivity upturn below 11 K persists under magnetic fields up to 14 T.

Resistivity exhibits a unique T^{1/2} scaling at low temperatures.

The behavior indicates a non-Fermi liquid state due to the orbital two-channel Kondo effect.

Abstract

Intercalation of magnetic atoms into the van der Waals gaps of layered transition metal dichalcogenides offers an excellent platform to produce exotic physical properties. Here, we report a detailed study of magnetic and electrical transport properties of Co$_{0.28}$TaS$_2$. The temperature dependent resistivity measurements display anomalous upturn below 11 K, which persists in presence of magnetic field even up to 14 T. In the low temperature region, the resistivity upturn exhibits a unique $T^{1/2}$ scaling behavior, which remains unchanged when an external magnetic field is applied. The $T^{1/2}$ dependence of resistivity upturn is the hallmark of non-Fermi liquid state in orbital two-channel Kondo effect(2CK). This anomalous resistivity upturn in Co$_{0.28}$TaS$_2$ can be attributed to the orbital two-channel Kondo mechanism.