Spin-Peierls transition in TiOCl

Details Spin-Peierls transition in TiOCl Spin-Peierls transition in TiOCl

2005-03-09

arxiv.org/abs/cond-mat/0503203v1

Phys. Rev. B 71, 100405(R) (2005)

Physics

Condensed Matter

Materials Science

Phys. Rev. B (Rapid Communications) in press

Scientific paper

10.1103/PhysRevB.71.100405

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}.

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