Magnetic ordering and spin dynamics in potassium jarosite: A Heisenberg kagomé lattice antiferromagnet

Low-energy singlets in the Heisenberg antiferromagnet on the kagomé lattice.

The spin-1/2 Heisenberg antiferromagnet on the kagomé lattice, is mapped by contractor renormalization to a spin-pseudospin Hamiltonian on the triangular superlattice. Variationally, we find a ground state with columnar dimer order. Dimer orientation fluctuations are described by an effective O(2) model at energies above an exponentially suppressed clock mass scale. Our results explain the larg...

Magnetic ordering and fluctuation in kagomé lattice antiferromagnets , Fe and Cr jarosites

Jarosite family compounds, KFe3(OH)6(SO4)2, (abbreviate Fe jarosite), and KCr3(OH)6(SO4)2, (Cr jarosite), are typical examples of the Heisenberg antiferromagnet on the kagomé lattice and have been investigated by means of magnetization and NMR experiments. The susceptibility of Cr jarosite deviates from Curie-Weiss law due to the short-range spin correlation below about 150K and shows the magne...

Magnetic transition and spin dynamics in the triangular Heisenberg antiferromagnet α-KCrO2

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Heisenberg Antiferromagnet on a Triangular Lattice

Spin waves in the frustrated kagomé lattice antiferromagnet KFe3(OH)6(SO4)2.

The spin wave excitations of the S=5/2 kagomé lattice antiferromagnet KFe3(OH)6(SO4)2 have been measured using high-resolution inelastic neutron scattering. We directly observe a flat mode which corresponds to a lifted "zero energy mode," verifying a fundamental prediction for the kagomé lattice. A simple Heisenberg spin Hamiltonian provides an excellent fit to our spin wave data. The antisymme...