Symmetry disquisition on the TiOX phase diagram

Abstract

The sequence of phase transitions and the symmetry of in particular the low temperature incommensurate and spin-Peierls phases of the quasi one-dimensional inorganic spin-Peierls system TiOX (TiOBr and TiOCl) have been studied using inelastic light scattering experiments. The anomalous first-order character of the transition to the spin-Peierls phase is found to be a consequence of the different symmetries of the incommensurate and spin-Peierls (P$2_1/m$) phases. The pressure dependence of the lowest transition temperature strongly suggests that magnetic interchain interactions play an important role in the formation of the spin-Peierls and the incommensurate phases. Finally, a comparison of Raman data on VOCl to the TiOX spectra shows that the high energy scattering observed previously has a phononic origin.

References in corpus (15)

• Experiments on Ladders Reveal a Complex Interplay between a Spin-Gapped Normal State and Superconductivity
• S=1/2 chains and spin-Peierls transition in TiOCl
• Spin-Peierls transition in TiOCl
• Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl
• Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR
• Optical study of orbital excitations in transition-metal oxides
• Infrared optical properties of the spin-1/2 quantum magnet $TiOCl$
• Incommensurate interactions and non-conventional spin-Peierls transition in TiOBr
• Giant phonon anomalies in the pseudo-gap phase of TiOCl
• Pressure-induced insulator-to-metal transition in low-dimensional TiOCl
• Heat capacity of the quantum magnet TiOCl
• Spin dynamics in the low-dimensional magnet TiOCl
• Muon-spin relaxation measurements on the dimerized spin-1/2 chains NaTiSi2O6 and TiOCl
• Spin gap formation in the quantum spin systems TiOX, X=Cl and Br
• Analysis of the phonon spectrum in the titanium oxyhalide TiOBr

Cited by in corpus (10)

• Probing defects and spin-phonon coupling in CrSBr via resonant Raman scattering
• Collective orbital excitations in orbitally ordered YVO3 and HoVO3
• Enhanced dimerization of TiOCl under pressure: spin-Peierls - to - Peierls transition
• Pressure-induced metallization and structural phase transition of the Mott-Hubbard insulator TiOBr
• Ab initio computation of d-d excitation energies in low-dimensional Ti and V oxychlorides
• Density functional study of the electronic and vibrational properties of TiOCl
• The role of magnetic order in VOCl
• Microscopic theory for the incommensurate transition in TiOCl
• Two pressure-induced structural phase transitions in TiOCl
• Heat conductivity of the spin-Peierls compounds TiOCl and TiOBr