Boldrin, D. , Fåk, B., Enderle, M., Bieri, S., Ollivier, J., Rols, S., Manuel, P. and Wills, A.S. (2015) Haydeeite: a spin-1/2 kagome ferromagnet. Physical Review B, 91(22), 220408(R). (doi: 10.1103/PhysRevB.91.220408)
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Abstract
The mineral haydeeite, α -MgCu 3 ( 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 K across 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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Boldrin, Dr David |
| Authors: | Boldrin, D., Fåk, B., Enderle, M., Bieri, S., Ollivier, J., Rols, S., Manuel, P., and Wills, A.S. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physical Review B |
| Publisher: | American Physical Society |
| ISSN: | 1098-0121 |
| ISSN (Online): | 1550-235X |
| Published Online: | 23 June 2015 |
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