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Two dimensional XY type magnetism in intercalated graphite: an elastic and inelastic neutron scattering study

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Zeitschrift für Physik B Condensed Matter

Abstract

Stage-2 CoCl2-GIC approximates a two-dimensional easy-plane (XY) ferromagnet on a triangular lattice. It has been found in prior work to order in two steps, with the intermediate phase showing long-ranged ferromagnetic correlations within the intercalate plane, but no correlations between neighboring planes. We have probed the wave vector and temperature dependence of the static and dynamic spin correlations in detail, including measurements of the critical scattering, the quasielastic scattering from vortex diffusion and the spin wave excitations with and without an external magnetic field. Some of the predictions for a Kosterlitz-Thouless type transition are met in this compound, at least qualitatively, including an apparent jump in the spin stiffness at the critical point and the existence of a diffusive central peak in the scattering function possibly originating from vortex autocorrelations. However, there are some inconsistencies between our observations and recent analytical studies as well as Monte Carlo-molecular dynamics simulations of the vortex dynamics that prevent unambigous assignment of the upper critical temperature as a vortex-binding transition.

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Author notes

  1. D. G. Wiesler

    Present address: Materials Science and Engineering Laboratory, National Institue of Standards and Technology, 20899, Gaithersburg, MD, USA

  2. H. Zabel

    Present address: Institut für Experimentalphysik IV, Ruhr Universität Bochum, Universitätsstrasse 150, D-44780, Bochum, Germany

Authors and Affiliations

  1. University of Illinois at Urbana-Champaign, 1110 W. Green St., 61801, Urbana, IL, USA

    D. G. Wiesler & H. Zabel

  2. Department of Physics, Brookhaven National Laboratory, 11973, Upton, NY, USA

    S. M. Shapiro

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  1. D. G. Wiesler
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  2. H. Zabel
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  3. S. M. Shapiro
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Wiesler, D.G., Zabel, H. & Shapiro, S.M. Two dimensional XY type magnetism in intercalated graphite: an elastic and inelastic neutron scattering study. Z. Physik B - Condensed Matter 93, 277–297 (1994). https://doi.org/10.1007/BF01312698

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