Spin gap formation in the quantum spin systems TiOX, X=Cl and Br

Abstract

In the layered quantum spin systems TiOCl and TiOBr the magnetic susceptibility shows a very weak temperature dependence at high temperatures and transition-induced phenomena at low temperatures. There is a clear connection of the observed transition temperatures to the distortion of the octahedra and the layer separation. Band structure calculations point to a relation of the local coordinations and the dimensionality of the magnetic properties. While from magnetic Raman scattering only a small decrease of the magnetic exchange by -5-10% is derived comparing TiOCl with TiOBr, the temperature dependence of the magnetic susceptibility favors a much bigger change.

5 figures, 15 pages, further information see http://www.peter-lemmens.de

References in corpus (7)

• Magnetic light scattering in low-dimensional quantum spin systems
• Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality
• Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR
• TiOCl, an orbital-ordered system?
• Infrared optical properties of the spin-1/2 quantum magnet $TiOCl$
• Giant phonon anomalies in the pseudo-gap phase of TiOCl
• Analysis of the phonon spectrum in the titanium oxyhalide TiOBr

Cited by in corpus (15)

• Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl
• Incommensurate interactions and non-conventional spin-Peierls transition in TiOBr
• Electronic structure of the two-dimensional Heisenberg antiferromagnet VOCl: a multi-orbital Mott insulator
• X-ray Scattering Study of the spin-Peierls transition and soft phonon behavior in TiOCl
• Symmetry disquisition on the TiOX phase diagram
• Microscopic model for transitions from Mott to spin-Peierls insulator in TiOCl
• Proposed low energy model Hamiltonian for spin-gapped system CuTe2O5
• One-dimensional versus two-dimensional correlation effects in the oxyhalides TiOCl and TiOBr
• Commensurate Fluctuations in the Pseudogap and Incommensurate spin-Peierls Phases of TiOCl
• Density functional study of the electronic and vibrational properties of TiOCl
• Cluster Dynamical Mean-field calculations for TiOCl
• Momentum-resolved single-particle spectral function for TiOCl from a combination of density functional and variational cluster calculations
• Singlet-Triplet Excitations in the Unconventional Spin-Peierls System TiOBr
• Critical properties of the unconventional spin-Peierls system TiOBr
• Lattice and orbital fluctuations in TiPO4