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

• Verfasst von: Rückamp, Reinhard [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl
• Verf.angabe: R. Rückamp, J. Baier, M. Kriener, M.W. Haverkort, T. Lorenz, G.S. Uhrig, L. Jongen, A. Möller, G. Meyer, and M. Grüninger
• Fussnoten: Gesehen am 08.11.2017
• Titel Quelle: Enthalten in: Physical review letters
• Jahr Quelle: 2005
• Band/Heft Quelle: 95(2005,9) Artikel-Nummer 097203, 4 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.95.097203
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565150716

Abstract

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.