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Spin dynamics in the hyperkagome compound Gd3Ga5O12

P. P. Deen, O. A. Petrenko, G. Balakrishnan, B. D. Rainford, C. Ritter, L. Capogna, H. Mutka, and T. Fennell
Phys. Rev. B 82, 174408 – Published 5 November 2010

Abstract

We present neutron inelastic-scattering results on the low-temperature magnetic state of the frustrated-hyperkagome compound Gd3Ga5O12 gadolinium gallium garnet (GGG). Our neutron-scattering studies reveal a remarkable range of time scales. Short-range spatial correlations appear static within the instrumental resolution (50μeV). Three distinct inelastic modes are found at 0.04(1), 0.12(2), and 0.58(3) meV at 0.06 K. The lowest and highest energy excitations show spatial dependencies indicative of dimerized short-range antiferromagnetic correlations that survive to high temperatures, comparable to the nearest-neighbor exchange interactions. Our results suggest that the ground state of a three-dimensional hyperkagome compound differs distinctly from its frustrated counterparts on a pyrochlore lattice and reveal a juxtaposition of co-operative paramagnetism and strong-dimerized coupling. These results are surprising since GGG is often classified as a strongly frustrated system with a manifold of connected states for which one would expect a continuum of gapless excitations.

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  • Received 12 October 2010

DOI:https://doi.org/10.1103/PhysRevB.82.174408

©2010 American Physical Society

Authors & Affiliations

P. P. Deen1, O. A. Petrenko2, G. Balakrishnan2, B. D. Rainford3, C. Ritter1, L. Capogna4, H. Mutka1, and T. Fennell1

  • 1Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France
  • 2Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
  • 3Department of Physics and Astronomy, Southampton University, Southampton SO17 0BJ, United Kingdom
  • 4Istituto Officina dei Materiali (IOM)-CNR, OGG 6 rue J. Horowitz, 38042 Grenoble, France

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Issue

Vol. 82, Iss. 17 — 1 November 2010

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