Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR

Abstract

We present electron spin resonance data of Ti${}^{3+}$ (3$d^1$) ions in single crystals of the novel layered quantum spin magnet TiOCl. The analysis of the g tensor yields direct evidence that the d_{xy} orbital from the t_{2g} set is predominantly occupied and owing to the occurrence of orbital order a linear spin chain forms along the crystallographic b axis. This result corroborates recent theoretical LDA+U calculations of the band structure. The temperature dependence of the parameters of the resonance signal suggests a strong coupling between spin and lattice degrees of freedom and gives evidence for a transition to a nonmagnetic ground state at 67 K.

revised version, accepted for publication in Phys. Rev. B, Rapid Comm

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Cited by in corpus (28)

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• 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-Peierls transition in TiPO${}_4$
• Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl
• Spin dynamics in the low-dimensional magnet TiOCl
• Correlation effects on the electronic structure of TiOCl: a NMTO+DMFT study
• Enhanced dimerization of TiOCl under pressure: spin-Peierls - to - Peierls transition
• Symmetry disquisition on the TiOX phase diagram
• 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
• Mott-Hubbard gap closure and structural phase transition in the oxyhalides TiOBr and TiOCl under pressure
• Ab-initio Phonon Calculations for the layered compound TiOCl
• Orbital and spin interplay in spin-gap formation in pyroxene titanium oxides ATiSi2O6 (A=Na, Li)
• One-dimensional versus two-dimensional correlation effects in the oxyhalides TiOCl and TiOBr
• Analysis of the phonon spectrum in the titanium oxyhalide TiOBr
• Pressure-induced metallization and structural phase transition of the Mott-Hubbard insulator TiOBr
• Momentum-resolved single-particle spectral function for TiOCl from a combination of density functional and variational cluster calculations
• High pressure x-ray study of spin-Peierls physics in the quantum spin chain material TiOCl
• Heat conductivity of the spin-Peierls compounds TiOCl and TiOBr
• Roles of two successive phase transitions in new spin-Peierls system TiOBr
• Pressure-induced Spin-Peierls to Incommensurate Charge-Density-Wave Transition in the Ground State of TiOCl