Power-law dynamics in the spin-liquid kagome lattices SrCr8Ga4O19 and ZnCu3(OH)6Cl2
arXiv:2206.04352 · doi:10.1103/PhysRevB.105.L241104
Abstract
We consider the polarization function P^{exp}_Z(t) measured by the muon-spin relaxation (muSR) technique for the SrCr8Ga4O19 and ZnCu3(OH)6Cl2 spin-liquid systems. We show the functional form of P^{exp}_Z(t) to imply that, in the temperature range of order 0.1 K, the spectral-weight function F(ω) of the magnetic correlations scales with 1/|ω|^{1 -x} (0 < x < 1) in the energy range of one microelectronvolt, i.e. \hbar ω~ 1 μeV. We derive the parameters involved in F(ω) from fits to available experimental data. Inelastic neutron scattering data probing F(ω) in the millielectronvolt energy range are consistent with a more conventional behavior. These differences could be due to a variety of spin-dynamics mechanisms, i.e. intrinsic to the kagome layer or related to the magnetic defects that have been evidenced in these compounds, acting at different energies. New muSR measurements are proposed and theoretical developments are suggested to pinpoint the mechanisms at play.
6 pages, 2 figures
References in corpus (8)
- Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2
- Projected wavefunction study of Spin-1/2 Heisenberg model on the Kagome lattice
- Quantum magnetism in the paratacamite family: towards an ideal kagome lattice
- Dynamic Scaling in the Susceptibility of the Spin-1\2 Kagome Lattice Antiferromagnet Herbertsmithite
- Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7
- Understanding the SR spectra of MnSi without magnetic polarons
- Dual nature of magnetism in MnSi
- Quantum half-orphans in kagome antiferromagnets