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

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 Mater. 15–18, 455 (1980); Ph.D. thesis, University Oslo, 1979 (unpublished), P. Ramirez R. N. Kleiman, Appl. 69, 5252 (1991)].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