Neutron inelastic scattering investigation of the magnetic excitations in Cu_2Te_2O_5X_2 (X=Br, Cl)

Abstract

Neutron inelastic scattering investigations have been performed on the spin tetrahedral system Cu_2Te_2O_5X_2 (X = Cl, Br). We report the observation of magnetic excitations with a dispersive component in both compounds, associated with the 3D incommensurate magnetic order that develops below $T_N^{Cl}$=18.2 K and $T_N^{Br}$=11.4 K. The excitation in Cu_2Te_2O_5Cl_2 softens as the temperature approaches $T_N^{Cl}$, leaving diffuse quasi-elastic scattering above the transition temperature. In the bromide, the excitations are present well above $T_N^{Br}$, which might be attributed to the presence of a degree of low dimensional correlations above $T_N^{Br}$ in this compound.

References in corpus (11)

• Evidence for an unconventional magnetic instability in the spin-tetrahedra system Cu_2Te_2O_5Br_2
• Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality
• Magnetism of a tetrahedral cluster spin-chain
• Halogen-mediated exchange in the coupled-tetrahedra quantum spin systems Cu2Te2O5X2 (X=Br,Cl)
• Incommensurate magnetic ordering in $C{u}_{2}T{e}_2{O}_5{X}_2$ (X=Cl,Br) studied by neutron diffraction
• Spin dynamics of a tetrahedral cluster magnet
• Low-lying excitations and magnetization process of coupled tetrahedral systems
• Magnetic Raman scattering of the ordered tetrahedral spin-1/2 clusters in Cu_2Te_2O_5(Br_(1-x)Cl_x)_2 compounds
• Weak antiferromagnetism and dimer order in quantum systems of coupled tetrahedra
• Ground state order and spin-lattice coupling in tetrahedral spin systems Cu2Te2O5X2
• Anisotropic field dependence of the magnetic transition in Cu2Te2O5Br2

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• Magnetic excitations and phonons in the spin-chain compound NaCu2O2
• Anomalous frequency and intensity scaling of collective and local modes in a coupled spin tetrahedron system
• Spin-lozenge thermodynamics and magnetic excitations in Na${}_3$RuO${}_4$
• Microscopic analysis of the magnetic form factor in low-dimensional cuprates
• Persistence of singlet fluctuations in the coupled spin tetrahedra system Cu2Te2O5Br2 revealed by high-field magnetization and 79Br NQR - 125Te NMR
• The effect of externally applied pressure on the magnetic behavior of Cu2Te2O5(BrxCl{1-x})2
• Series expansion analysis of a tetrahedral cluster spin chain