Abstract
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∼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 α<0 at the ordering transition, consistent with a transition in a random magnetic environment.
Original language | English (US) |
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Pages (from-to) | 2500-2503 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 73 |
Issue number | 18 |
DOIs | |
State | Published - 1994 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy