Spin-Peierls transition in TiOCl

Abstract

Temperature-dependent x-ray diffraction of the low-dimensional spin 1/2 quantum magnet TiOCl shows that the phase transition at T_{c2} = 90 K corresponds to a lowering of the lattice symmetry. Below T_{c1} = 66 K a twofold superstructure develops, that indicates the formation of spin-singlet pairs via direct exchange between neighboring Ti atoms, while the role of superexchange is found to be negligible. TiOCl thus is identified as a spin-Peierls system of pure 1D chains of atoms. The first-order character of the transition at T_{c1} is explained by the competition between the structurally deformed state below T_{c2} and the spin-Peierls state below T_{c1}.

Phys. Rev. B (Rapid Communications) in press

References in corpus (6)

• Magnetic light scattering in low-dimensional quantum spin systems
• S=1/2 chains and spin-Peierls transition in TiOCl
• 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 $TiOCl$
• Analysis of the phonon spectrum in the titanium oxyhalide TiOBr

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