Magnetism of kagome metals $\left({\text{Fe}}_{1-x}{\text{Co}}_x\right)\text{Sn}$ studied by $\mu$SR

Abstract

We study the magnetic properties of the metallic kagome system $\left({\mathrm{Fe}}_{1-x}{\mathrm{Co}}_x\right)\mathrm{Sn}$ by a combination of Muon Spin Relaxation ($\mu \mathrm{SR}$), magnetic susceptibility and Scanning Tunneling Microscopy (STM) measurements, in single crystal specimens with Co concentrations $\mathrm{x}=0,0.11,0.8$. In the undoped antiferromagnetic compound FeSn, we find possible signatures for a previously unidentified phase that sets in at $T^{\ast }\sim 50$ K, well beneath the Neel temperature $T_N\sim 376$ K, as indicated by a peak in the relaxation rate $1/T_1$ observed in zero field (ZF) and longitudinal field (LF) $\mu \mathrm{SR}$ measurements, with a corresponding anomaly in the ac and dc-susceptibility, and an increase in the static width $1/T_2$ in ZF measurements. No signatures of spatial symmetry breaking are found in STM down to $7$ K. In ${\mathrm{Fe}}_{0.2}{\mathrm{Co}}_{0.8}\mathrm{Sn}$, we find canonical spin glass behavior with freezing temperature $T_g\sim 3.5\mathrm{K}$; the ZF and LF time spectra exhibit results similar to those observed in dilute alloy spin glasses CuMn and AuFe, with a critical behavior of $1/T_1$ at $T_g$ and $1/{\mathrm{T}}_1\to 0$ as $T\to 0$. The absence of spin dynamics at low temperatures makes a clear contrast to the spin dynamics observed by $\mu \mathrm{SR}$ in many geometrically frustrated spin systems on insulating kagome, pyrochlore, and triangular lattices. The spin glass behavior of CoSn doped with dilute Fe moments is shown to originate primarily from the randomness of doped Fe moments rather than due to geometrical frustration of the underlying lattice.

References in corpus (44)

• High temperature fractional quantum Hall states
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Nearly-flat bands with nontrivial topology
• Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2
• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
• Topological kagome magnets and superconductors
• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Time-reversal symmetry-breaking charge order in a kagome superconductor
• Quantum magnetism in the paratacamite family: towards an ideal kagome lattice
• Topological flat bands in frustrated kagome lattice CoSn
• Three-dimensional charge density wave and robust zero-bias conductance peak inside the superconducting vortex core of a kagome superconductor CsV${}_3$Sb${}_5$
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2
• Discovery of charge density wave in a correlated kagome lattice antiferromagnet
• Rotation symmetry breaking in the normal state of a kagome superconductor KV3Sb5
• Fermi surface mapping and the nature of charge density wave order in the kagome superconductor CsV${}_3$Sb${}_5$
• Kagome superconductors AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Three-state nematicity and magneto-optical Kerr effect in the charge density waves in kagome superconductors
• Charge density wave in kagome lattice intermetallic ScV6Sn6
• Quantum states and intertwining phases in kagome materials
• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Fantastic flat bands and where to find them: The CoSn-type compounds
• Dynamic Magnetic Crossover at the Origin of the Hidden-Order in van der Waals Antiferromagnet CrSBr
• Barlowite: A Spin-1/2 Antiferromagnet with a Geometrically Perfect Kagome Motif
• Chiral excitonic order from twofold van Hove singularities in kagome metals
• Softening of a flat phonon mode in the kagome ScV${}_6$Sn${}_6$
• Competing charge-density wave instabilities in the kagome metal ScV${}_6$Sn${}_6$
• Spin-phonon coupling driven Charge density wave in a Kagome Magnet
• Correlated order at the tipping point in the kagome metal CsV${}_3$Sb${}_5$
• Flat band separation and robust spin-Berry curvature in bilayer kagome metals
• Spin excitations in metallic kagome lattice FeSn and CoSn
• Loop-current charge density wave driven by long-range Coulomb repulsion on the kagome lattice
• Tuning the flat bands of the kagome metal CoSn with Fe, In, or Ni doping
• Frustrated charge order and cooperative distortions in ScV6Sn6
• Ferromagnetic helical nodal line and Kane-Mele spin-orbit coupling in kagome metal Fe3Sn2
• Stability frontiers in the AM${}_6$X${}_6$ kagome metals: The LnNb${}_6$Sn${}_6$ (Ln:Ce-Lu,Y) family and density-wave transition in LuNb${}_6$Sn${}_6$
• The kagome Hubbard model from a functional renormalization group perspective
• Van-Hove annihilation and nematic instability on a Kagome lattice
• Spin-polarized imaging of the antiferromagnetic structure and field-tunable bound states in kagome magnet FeSn
• Absence of $E_{2g}$ nematic instability and dominant $A_{1g}$ response in the kagome metal CsV${}_3$Sb${}_5$
• Visualizing symmetry-breaking electronic orders in epitaxial Kagome magnet FeSn films
• Observation of Hybrid Magnetic Skyrmion Bubbles in Fe3Sn2 Nanodisks
• Low-Energy Electronic Structure in the Unconventional Charge-Ordered State of ScV${}_6$Sn${}_6$

Cited by in corpus (1)

• Walking on Archimedean Lattices: Insights from Bloch Band Theory