Deen, P. P., Petrenko, O. A., Balakrishnan, G., Rainford, B. D., Ritter, C., Capogna, L., Mutka, H. and Fennell, T.. (2010) Spin dynamics in the hyperkagome compound Gd3Ga5O12. Physical Review B, Vol.82 (No.17). Article: 174408 . ISSN 1098-0121

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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 (50 mu eV). 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.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review B
Publisher:	American Physical Society
ISSN:	1098-0121
Official Date:	5 November 2010
Volume:	Vol.82
Number:	No.17
Number of Pages:	5
Page Range:	Article: 174408
Identification Number:	10.1103/PhysRevB.82.174408
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/4831

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