TY - JOUR
T1 - Thermal studies of the spin liquid state and analog to the4He melting curve in a geometrically frustrated magnet
AU - Tsui, Y. K.
AU - Burns, C. A.
AU - Snyder, J.
AU - Schiffer, P.
N1 - Funding Information:
The authors acknowledge the financial support of the NSF grant DMR97-01548, ARO grant DAAG55-98-1-0032, and the Alfred P. Sloan Foundation. We are grateful for helpful discussions with G. Jones and D.A. Huse. We thank V. Fratello and A.J. Valentino at Bell Laboratories for sample preparation, and N. Kalechofsky (now at Oxford Instruments) for assistance in the early stages of these experiments.
PY - 2000
Y1 - 2000
N2 - Gadolinium gallium garnet, Gd3Ga5O12 (GGG) has an extraordinary low-temperature phase diagram. Although the Curie-Weiss temperature of GGG is ∼ - 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), a field-induced long-range ordered antiferromagnetic state at fields of between 0.7 and 1.3 T, and, at intermediate fields, an apparent spin-liquid state without long-range order. We have characterized the intermediate field (IF) state through heat capacity, thermal conductivity, and magnetocaloric measurements. Our results show a sharp high-field phase boundary of the thermal irreversibility of the spin glass phase of GGG implying that the intermediate field phase is distinct from the spin glass. The lower field boundary of the AFM phase is shown to have distinct minimum at T ∼ 0.2 K, in analogy to the minimum in the melting curve of 4He. The existence of such a minimum is confirmed by measurements of the latent heat of the transition below that temperature.
AB - Gadolinium gallium garnet, Gd3Ga5O12 (GGG) has an extraordinary low-temperature phase diagram. Although the Curie-Weiss temperature of GGG is ∼ - 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), a field-induced long-range ordered antiferromagnetic state at fields of between 0.7 and 1.3 T, and, at intermediate fields, an apparent spin-liquid state without long-range order. We have characterized the intermediate field (IF) state through heat capacity, thermal conductivity, and magnetocaloric measurements. Our results show a sharp high-field phase boundary of the thermal irreversibility of the spin glass phase of GGG implying that the intermediate field phase is distinct from the spin glass. The lower field boundary of the AFM phase is shown to have distinct minimum at T ∼ 0.2 K, in analogy to the minimum in the melting curve of 4He. The existence of such a minimum is confirmed by measurements of the latent heat of the transition below that temperature.
KW - Antiferromagnet
KW - Frustration
KW - Gadolinium gallium garnet
KW - Magnetic transitions
KW - Spin glass
UR - http://www.scopus.com/inward/record.url?scp=0033884891&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033884891&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(99)01697-X
DO - 10.1016/S0921-4526(99)01697-X
M3 - Conference article
AN - SCOPUS:0033884891
SN - 0921-4526
VL - 280
SP - 296
EP - 300
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 1-4
T2 - 22nd International Conference on Low Temperature Physics (LT-22)
Y2 - 4 August 1999 through 11 August 1999
ER -