Study of the low temperature thermal properties of the geometrically frustrated magnet: Gadolinium gallium garnet

Y. K. Tsui, N. Kalechofsky, C. A. Burns, P. Schiffer

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations

Abstract

Gadolinium gallium garnet, Gd3Ga5O12 (GGG) has an extraordinary low temperature phase diagram. Although the Curie-Weiss temperature of GGG is about -2 K, GGG shows no long-range order down to T∼0.4 K. At low temperatures GGG has a spin glass phase at low fields (≤0.1 T) and a field-induced long-range order antiferromagnetic state at fields of between 0.7 and 1.3 T [P. Schiffer et al., Phys. Rev. Lett. 73, 2500 (1994), S. Hov, H. Bratsberg, and A. T. Skjeltorp, J. Magn. Magn. Mater. 15-18, 455 (1980); S. Hov, Ph.D. thesis, University of Oslo, 1979 (unpublished), A. P. Ramirez and R. N. Kleiman, J. Appl. Phys. 69, 5252 (1991)]. However, the nature of the ground state at intermediate fields is still unknown, and has been hypothesized to be a three-dimensional spin liquid. We have measured the thermal conductivity (κ) and heat capacity (C) of a high-quality single crystal of GGG in the low temperature regime in order to study the nature of this state. The field dependence of κ shows that phonons are the predominant heat carriers and are scattered by spin fluctuations. We observe indications in κ(H) and C(H) of both the field induced ordering and the spin glass phase at low temperatures (T≤200 mK).

Original languageEnglish (US)
Pages (from-to)4512-4514
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II A
DOIs
StatePublished - Apr 15 1999
Externally publishedYes
EventProceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States
Duration: Nov 9 1998Nov 12 1998

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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