Incommensurate interactions and non-conventional spin-Peierls transition in TiOBr

Details Incommensurate interactions and non-conventional spin-Peierls transition in TiOBr Incommensurate interactions and non-conventional spin-Peierls transition in TiOBr

2005-04-18

arxiv.org/abs/cond-mat/0504445v1

Phys. Rev. B 72, 020105(R), 2005

Physics

Condensed Matter

Other Condensed Matter

5 pages including 3 figures and 1 table

Scientific paper

10.1103/PhysRevB.72.020105

Temperature-dependent x-ray diffraction of the low-dimensional spin 1/2 quantum magnet TiOBr shows that the phase transition at T_{c2} = 47.1 (4) K corresponds to the development of an incommensurate superstructure. Below T_{c1} = 26.8 \pm 0.3 K the incommensurate modulation locks in into a two-fold superstructure similar to the low-temperature spin-Peierls state of TiOCl. Frustration between intra- and interchain interations within the spin-Peierls scenario, and competition between two-dimensional magnetic order and one-dimensional spin-Peierls order are discussed as possible sources of the incommensurability.

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