Department of Physics Papers

Document Type

Journal Article

Date of this Version

6-23-2006

Publication Source

Physical Review Letters

Volume

96

Start Page

247201-1

Last Page

247201-4

DOI

10.1103/PhysRevLett.96.247201

Abstract

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 antisymmetric Dzyaloshinskii-Moriya interaction is the primary source of anisotropy and explains the low-temperature magnetization and spin structure.

Comments

At the time of publication, author Taner Yildirim was affiliated with the NIST Center for Neutron Research, Gaithersburg, Maryland. Currently, he is a faculty member in the Materials Science and Engineering Department at the University of Pennsylvania.

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Date Posted: 20 August 2015

This document has been peer reviewed.