Magnon Damping as a Probe of Kondo Coupling in Magnetically Ordered Systems

Abstract

In $d$-electron systems, there can also be intricate interplay between Kondo coupling and magnetic interactions as that in $f$-electron systems, but the underlying mechanism remains elusive. Here, using inelastic neutron scattering, we investigate the temperature evolution of the low-energy spin waves (magnons) in a metallic van der Waals ferromagnet Fe${}_{3-x}$GeTe${}_2$, and observe that the magnon damping diverges at both low and high temperatures and exhibits a minimum at an intermediate temperature. These behaviours are described by a formula that combines logarithmic and power-law terms, representing the dominant contributions from Kondo coupling and thermal fluctuations, respectively. These findings can be explained by considering electron-magnon scattering of spin-flip type within the ferromagnetic Kondo-Heisenberg lattice model, distinct from the original Kondo effect which only considers the coupling between itinerant electrons and isolated impurity spins. These results unveil the intriguing interplay between itinerant electrons and spin waves in metallic 3$d$-electron systems with magnetic order, and provide magnon damping as a new effective probe of Kondo coupling in metallic quantum magnets, thereby opening new avenues for exploring Kondo physics from the magnon perspective.

arXiv commentPublished in Nature Communications

References in corpus (32)

• Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe${}_3$GeTe${}_2$
• Fermi-liquid instabilities at magnetic quantum phase transitions
• Two-Dimensional Itinerant Ising Ferromagnetism in Atomically thin Fe3GeTe2
• Time-dependent variational principle for quantum lattices
• Unifying time evolution and optimization with matrix product states
• The break up of heavy electrons at a quantum critical point
• Superconducting phases of f-electron compounds
• Onset of antiferromagnetism in heavy fermion metals
• Magnetic-Field Induced Quantum Critical Point in YbRh${}_2$Si${}_2$
• Spin Waves and Magnetic Exchange Interactions in CaFe2As2
• Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2
• Strange metal behavior in a pure ferromagnetic Kondo lattice
• Electronic Correlation and Magnetism in the Ferromagnetic Metal Fe3GeTe2
• Heavy-electron quantum criticality and single-particle spectroscopy
• A novel heavy-fermion state in CaCu_3Ru_4O12
• Critical behavior of the van der Waals bonded ferromagnet Fe${}_{3-x}$GeTe${}_2$
• Unconventional temperature enhanced magnetism in iron telluride
• Geometry of Matrix Product States: metric, parallel transport and curvature
• Evolution of the Kondo lattice electronic structure above the transport coherence temperature
• Emergent Kondo scaling in iron-based superconductors AFe2As2 (A = K, Rb, Cs)
• The underscreened Kondo lattice model applied to heavy fermion uranium compounds
• Kondo holes in the 2D itinerant Ising ferromagnet Fe3GeTe2
• Tangent Space Approach for Thermal Tensor Network Simulations of the 2D Hubbard Model
• Series-Expansion Thermal Tensor Network Approach for Quantum Lattice Models
• Orbital-selective Kondo entanglement and antiferromagnetic order in USb${}_2$
• Orbital-selective Kondo-lattice and enigmatic f-electrons emerging from inside the antiferromagnetic phase of a heavy fermion
• Magnetic excitations in the quasi-2D ferromagnet Fe3-xGeTe2 measured with inelastic neutron scattering
• Electronic correlations in the van der Waals ferromagnet Fe${}_3$GeTe${}_2$ revealed by its charge dynamics
• Antiferromagnetic fluctuations and orbital-selective Mott transition in the van der Waals ferromagnet Fe3-xGeTe2
• The dual nature of magnetism in a uranium heavy fermion system
• ARPES signature of the competition between magnetic order and Kondo effect in CeCoGe3
• Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in Mn${}_3$P