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Haydeeite: a spin-1/2 kagome ferromagnet
- Source :
- Physical Review B 91 (2015) 220408(R)
- Publication Year :
- 2015
-
Abstract
- 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.
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Subjects
Details
- Database :
- arXiv
- Journal :
- Physical Review B 91 (2015) 220408(R)
- Publication Type :
- Report
- Accession number :
- edsarx.1503.08023
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.91.220408