期刊
PHYSICAL REVIEW B
卷 91, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.220408
关键词
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资金
- French Agence Nationale de la Recherche [ANR-12-BS04-0021]
- Science and Technology Facilities Council (STFC), U.K
- Institut Laue-Langevin
- UCL
- Engineering and Physical Sciences Research Council [957070] Funding Source: researchfish
The mineral haydeeite, alpha-MgCu3(OD)(6)Cl-2, is a S = 1/2 kagome ferromagnet that displays long-range magnetic order below T-C = 4.2 K with a strongly reduced moment. Our inelastic neutron scattering data show clear spin-wave excitations that are well described by a Heisenberg Hamiltonian with a ferromagnetic nearest-neighbor exchange J(1) = -38 K and an antiferromagnetic exchange J(d) = +11 Kacross the hexagons of the kagome lattice. These values place haydeeite in the ferromagnetic part of the phase diagram, close to the cuboc2 type noncoplanar 12-sublattice antiferromagnetic order of cuboctahedral symmetry. Diffuse dynamic short-range ferromagnetic correlations observed above T-C persist well into the ferromagnetically ordered phase with a behavior distinct from critical scattering.
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