Spin dynamics of a tetrahedral cluster magnet

Abstract

We study the magnetism of a lattice of coupled tetrahedral spin-1/2 clusters which might be of relevance to the tellurate compounds Cu2Te2O5X2, with X=Cl, Br. Using the flow equation method we perform a series expansion in terms of the inter-tetrahedral exchange couplings starting from the quadrumer limit. Results will be given for the magnetic instabilities of the quadrumer phase and the dispersion of elementary triplet excitations. In limiting cases of our model of one- or two dimensional character we show our results to be consistent with findings on previously investigated decoupled tetrahedral chains and the Heisenberg model on the 1/5-depleted square lattice.

5 pages, 5 figures, 7 eps files

References in corpus (1)

• Low-lying excitations and magnetization process of coupled tetrahedral systems

Cited by in corpus (21)

• Quantum Phases of the Planar Antiferromagnetic J_1-J_2-J_3 Heisenberg-Model
• Optical study of orbital excitations in transition-metal oxides
• Flow Equations and Normal Ordering. A Survey
• Investigation of the oxohalogenide Cu4Te5O12Cl4 with weakly coupled Cu(II) tetrahedra
• Incommensurate magnetic ordering in $C{u}_{2}T{e}_2{O}_5{X}_2$ (X=Cl,Br) studied by neutron diffraction
• Weak antiferromagnetism and dimer order in quantum systems of coupled tetrahedra
• Ground state order and spin-lattice coupling in tetrahedral spin systems Cu2Te2O5X2
• On the valence-bond solid phase of the crossed-chain quantum spin model
• Quantum phase diagram of a frustrated antiferromagnet on the bilayer honeycomb lattice
• Neutron inelastic scattering investigation of the magnetic excitations in Cu_2Te_2O_5X_2 (X=Br, Cl)
• Series Expansion Analysis of a Frustrated Four-Spin-Tube
• Wither the sliding Luttinger liquid phase in the planar pyrochlore
• Anomalous frequency and intensity scaling of collective and local modes in a coupled spin tetrahedron system
• Unusual criticality of Cu2Te2O5Br2 under pressure
• Quantum phases of a frustrated four-leg spin tube
• The effect of externally applied pressure on the magnetic behavior of Cu2Te2O5(BrxCl{1-x})2
• NMR and NQR study of the tetrahedral frustrated quantum spin system Cu2Te2O5Br2 in its paramagnetic phase
• Series expansion analysis of a tetrahedral cluster spin chain
• Anisotropic field dependence of the magnetic transition in Cu2Te2O5Br2
• Strong-coupling expansion and effective hamiltonians
• Incommensurate magnetism in the coupled spin tetrahedra system Cu2Te2O5Cl2