Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl

Details Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl

2005-03-16

arxiv.org/abs/cond-mat/0503409v1

Physical Review Letters 95, 097203 (2005).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.95.097203

We report on the magnetic, thermodynamic and optical properties of the quasi-one-dimensional quantum antiferromagnets TiOCl and TiOBr, which have been discussed as spin-Peierls compounds. The observed deviations from canonical spin-Peierls behavior, e.g. the existence of two distinct phase transitions, have been attributed previously to strong orbital fluctuations. This can be ruled out by our optical data of the orbital excitations. We show that the frustration of the interchain interactions in the bilayer structure gives rise to incommensurate order with a subsequent lock-in transition to a commensurate dimerized state. In this way, a single driving force, the spin-Peierls mechanism, induces two separate transitions.

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