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Investigation of the Field Induced Antiferromagnetic Phase Transition in the Frustrated Magnet: Gadolinium Gallium Garnet

1994; American Physical Society; Volume: 73; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.73.2500

1092-0145

P. Schiffer, A. P. Ramirez, David A. Huse, A.J. Valentino,

Magnetic properties of thin films

The geometrically frustrated magnet gadolinium gallium garnet (GGG) has a unique low temperature (0.38 K.) antiferromagnetic phase which exists only in finite fields ($H\ensuremath{\sim}1$ T). We have measured the specific heat and magnetic susceptibility of GGG to obtain the first accurate map of the low temperature phase diagram. A ground state magnetic structure in this field regime has been determined by simulations including both the exchange and dipole interactions. We find a critical exponent $\ensuremath{\alpha}0$ at the ordering transition, consistent with a transition in a random magnetic environment.