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Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR

V. Kataev, J. Baier, A. Möller, L. Jongen, G. Meyer, and A. Freimuth
Phys. Rev. B 68, 140405(R) – Published 14 October 2003
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Abstract

We present electron-spin-resonance data of Ti3+ (3d1) ions in single crystals of the novel layered quantum spin magnet TiOCl. The analysis of the g tensor yields direct evidence that the dxy orbital from the t2g set is predominantly occupied and owing to the occurrence of orbital order a linear spin chain forms along the crystallographic b axis. This result corroborates recent theoretical local-density approximation + U calculations of the band structure. The temperature dependence of the parameters of the resonance signal suggests a strong coupling between spin and lattice degrees of freedom and gives evidence for a transition to a nonmagnetic ground state at 67 K.

  • Received 14 May 2003

DOI:https://doi.org/10.1103/PhysRevB.68.140405

©2003 American Physical Society

Authors & Affiliations

V. Kataev1,2,*, J. Baier1, A. Möller3, L. Jongen3, G. Meyer3, and A. Freimuth1

  • 1II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
  • 2Kazan Physical Technical Institute, Russian Academy of Sciences, 420111 Kazan, Russia
  • 3Institut für Anorganische Chemie, Universität zu Köln, 50939 Köln, Germany

  • *Electronic address: kataev@ph2.uni-koeln.de

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Vol. 68, Iss. 14 — 1 October 2003

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