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Magnetic excitations in the quasi one-dimensional antiferromagnetic singlet groundstate system CsFeBr3

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Zeitschrift für Physik B Condensed Matter

Abstract

We have measured the magnetic excitations in CsFeBr3 along the chain direction (z-axis) and perpendicular to it by inelastic neutron scattering. The measured dispersion curves can be reproduced by the formula

$$\omega ^2 (q) = A^2 - 8A[J\cos (\pi q_c ) + J'\gamma (2\pi q_ \bot )]R(T)$$

which is very different from dispersion relations for usual 1 D antiferromagnets, because of the singlet groundstate of this system. The large value of the anisotropy energyA/k=29.8±0.5 K, which is independent of temperature, causes the singlet groundstate. The intra-and inter-chain exchange parameters areJ/k=−3.2±0.15K andJ'/k=−0.32±0.02 K determined atT=1.4 K. At 1.4 K the renormalisation factor is taken to beR(T)=1. AtT=30 K the value forR(T) was found to be 0.5±0.1 keepingJ andJ' unchanged. The excitations at (1/3 1/31) show soft mode behaviour but no phase transition. The observed intensities are interpreted by a heuristic model for the eigenvectors in the excited state including antiferro-as well as ferromagnetic configurations of the fluctuations.

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Author notes

  1. U. Steigenberger

    Present address: Rutherford Appleton Laboratory, OX 110 QX, Chilton, Didcot, UK

Authors and Affiliations

  1. Institut Laue-Langevin, B.P. 156 X, F-38042, Grenoble Cedex, France

    B. Dorner & U. Steigenberger

  2. Inorganic Chemistry Laboratory, South Parks Road, OX1 3QR, Oxford, UK

    D. Visser

  3. Hahn-Meitner-Institut, Postfach 390128, D-1000, Berlin 39, Germany

    K. Kakurai & M. Steiner

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  1. B. Dorner
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  2. D. Visser
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  3. U. Steigenberger
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  4. K. Kakurai
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  5. M. Steiner
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Dorner, B., Visser, D., Steigenberger, U. et al. Magnetic excitations in the quasi one-dimensional antiferromagnetic singlet groundstate system CsFeBr3 . Z. Physik B - Condensed Matter 72, 487–496 (1988). https://doi.org/10.1007/BF01314530

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  • DOI: https://doi.org/10.1007/BF01314530

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