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

被引：139

作者：

Matan, K

Grohol, D

Nocera, DG

Yildirim, T

Harris, AB

Lee, SH

Nagler, SE

Lee, YS

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] MIT, Dept Chem, Cambridge, MA 02139 USA

[3] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[5] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA

[6] Oak Ridge Natl Lab, Ctr Neutron Scattering, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 24期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.96.247201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The spin wave excitations of the S=5/2 kagome 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 kagome 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.

引用

页数：4

共 26 条

[1] Models for ordering in the jarosites Kagome systems [J].