| Autor: |
Boldrin, D., Fak, B., Enderle, M., Bieri, S., Ollivier, J., Rols, S., Manuel, P., Wills, A. S. |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Physical Review B 91 (2015) 220408(R) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.91.220408 |
| Popis: |
The mineral haydeeite, alpha-MgCu3(OD)6Cl2, is a S=1/2 kagome ferromagnet that displays long-range magnetic order below TC=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 ferromagnetic nearest-neighbor exchange J1=-38 K and antiferromagnetic exchange Jd=+11 K across the hexagons of the kagome lattice. These values place haydeeite very close to the quantum phase transition between ferromagnetic order and non-coplanar twelve-sublattice cuboc2 antiferromagnetic order. Diffuse dynamic short-range ferromagnetic correlations observed above TC persist well into the ferromagnetically ordered phase with a behavior distinct from critical scattering. |
| Databáze: |
arXiv |
| Externí odkaz: |
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