Haydeeite: a spin-1/2 kagome ferromagnet

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.

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• Quantum Magnetism in Minerals
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• Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe${}_4$As${}_4$
• Vesignieite: a $S=\frac{1}{2}$ kagome antiferromagnet with dominant third-neighbor exchange
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• $ab$-$initio$ Approaches for Low-Energy Spin Hamiltonians
• $\mathbf{q}=0$ long-range magnetic order in centennialite CaCu${}_3$(OD)${}_6$Cl${}_2$$\cdot$0.6D${}_2$O: A spin-1/2 perfect kagome antiferromagnet with $J_1$-$J_2$-$J_d$
• Topological thermal Hall effect driven by fluctuation of spin chirality in frustrated antiferromagnets
• Kagome quantum spin systems in the atacamite family
• Emergent spin-1 trimerized valence bond crystal in the spin-1/2 Heisenberg model on the star lattice
• Strain-Induced Topological Magnon Phase Transitions: Applications to Kagome-Lattice Ferromagnets
• Large magnetocaloric effect in the kagome ferromagnet Li${}_9$Cr${}_3$(P${}_2$O${}_7$)${}_3$(PO${}_4$)${}_2$
• The route to magnetic order in the spin-$1/2$ kagome Heisenberg antiferromagnet: The role of interlayer coupling
• Noncoplanar orders and quantum disordered states in maple-leaf (anti)ferromagnets
• Antiferromagnetism in kagome $\alpha$-Cu${}_3$Mg(OH)${}_6$Br${}_2$
• Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite
• Noncoplanar multi-k states in frustrated spinel and kagome magnets
• Role of chemical pressure on the electronic and magnetic properties of spin-1/2 kagome mineral averievite
• Phase diagram of multiferroic KCu${}_3$As${}_2$O${}_7$(OD)${}_3$
• Electronic States and Anomalous Hall Effect in Strongly Correlated Topological Systems
• Emergence of Frustrated Short-Range Order above Long-Range Order in the $S=1/2$ Kagome Antiferromagnet CaCu${}_3$(OD)${}_6$Cl${}_2\cdot 0.6$D${}_2$O
• Tuning bulk topological magnon properties with light-induced magnons
• Fractional Spin Quantum Hall Effect in Weakly Coupled Spin Chain Arrays
• Discrete time crystal made of topological edge magnons
• Crystal chemistry criteria of the existence of spin liquids on the kagome lattice
• Survival of magnetic correlations above ordering temperature in a ferromagnetically ordered classical kagomé magnet: Li9Cr3(P2O7)3(PO4)2
• Topological characterization of magnon-polaron bands and thermal Hall conductivity in a frustrated kagome antiferromagnet
• Exerting chemical pressure on the kagome lattice as frustration control in the kapellasite family $A$Cu${}_3$(OH)${}_{6+x}$(Cl,Br)${}_{3-x}$
• Emergence of a Fluctuating Ground State in Y-kapellasite under Pressure
• Neutron scattering evidence for two-dimensionally coupled spin-dimerized antiferromagnetic lattice in α-Cu2P2O7