Ground state order and spin-lattice coupling in tetrahedral spin systems Cu2Te2O5X2

Abstract

High-resolution ac susceptibility and thermal conductivity measurement on Cu2Te2O5X2(X=Br,Cl) single crystals are reported. For Br-sample, sample dependence prevents to distinguish between possibilities of magnetically ordered and spin-singlet ground states. In Cl-sample a three-dimensional transition at 18.5 K is accompanied by almost isotropic behavior of susceptibility and almost switching behavior of thermal conductivity. Thermal conductivity studies suggest the presence of a tremendous spin-lattice coupling characterizing Cl- but not Br-sample. Below the transition Cl-sample is in a complex magnetic state involving AF order but also the elements consistent with the presence of a gap in the excitation spectrum.

version accepted for publication in Phys.Rev.B-Rapid Communication

References in corpus (9)

• Magnetic light scattering in low-dimensional quantum spin systems
• Evidence for an unconventional magnetic instability in the spin-tetrahedra system Cu_2Te_2O_5Br_2
• Strong damping of phononic heat current by magnetic excitations in SrCu_2(BO_3)_2
• Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality
• Anomalous thermal conductivity of NaV2O5 as compared to conventional spin-Peierls system CuGeO3
• Universal behavior of spin-mediated energy transport in S=1/2 chain cuprates: BaCu2Si2O7 as an example
• 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

Cited by in corpus (14)

• 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
• Incommensurate magnetic ordering in Cu2Te2O5X2 (X=Cl, Br) studied by single crystal neutron diffraction
• Site-selective quantum correlations revealed by magnetic anisotropy in the tetramer system SeCuO3
• New Method to Calculate the Sign and Relative Strength of Magnetic Interactions in Low-Dimensional Systems on the Basis of Structural Data
• Neutron inelastic scattering investigation of the magnetic excitations in Cu_2Te_2O_5X_2 (X=Br, Cl)
• Anomalous frequency and intensity scaling of collective and local modes in a coupled spin tetrahedron system
• Persistence of singlet fluctuations in the coupled spin tetrahedra system Cu2Te2O5Br2 revealed by high-field magnetization and 79Br NQR - 125Te NMR
• Singlet state formation and its impact on magnetic structure in tetramer system SeCuO${}_3$
• Unusual criticality of Cu2Te2O5Br2 under pressure
• 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
• Incommensurate magnetism in the coupled spin tetrahedra system Cu2Te2O5Cl2