Observation of Complete Orbital Two-channel Kondo Effect in van der Waals Ferromagnet Fe3GaTe2

TL;DR

This study reports the first observation of all three transport regimes of the orbital two-channel Kondo effect in a van der Waals ferromagnet, revealing non-Fermi liquid behavior and spin texture signatures.

Contribution

It provides the complete three-regime transport evidence of the orbital 2CK effect in Fe3GaTe2, a non-magnetic origin of TLSs, and links magnetoresistance to spin-magnon scattering.

Findings

Observation of all three resistive regimes of the orbital 2CK effect.

Electron behavior transitions from scattering to NFL and Fermi liquid regimes.

Linear negative magnetoresistance related to spin-magnon scattering, not topological Hall effect.

Abstract

Orbital two-channel Kondo (2CK) effect is one of the crucial systems with non- Fermi liquid (NFL) behaviors. But the full three-regime transport evidence has never been observed in one sample. Here, all three-resistive regimes for the orbital 2CK effect induced by two-level systems (TLSs) have been observed in the van der Waals ferromagnet Fe3GaTe2. The electron behavior undergoes a continuous transition from electron scattering to the NFL behavior, and subsequently to Fermi liquid behavior. The magnetic field does not affect any regimes, indicating the non-magnetic origin of the TLSs in Fe3GaTe2. In addition, the slope of linear negative magnetoresistance, rather than the topological Hall effect, has been found to be related to spin-magnon scattering and can be used to infer the emergence of spin textures. Our findings indicate Fe3GaTe2 may be an ideal platform to study electron-correlation and topological phenomena.