期刊
PHYSICAL REVIEW B
卷 82, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.014406
关键词
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资金
- NSF [CHE-0910472, NSF-DMR-0506946, NSF-DMR-0705847, NSF-DMR-0451605]
- ARO [W911NF-08-1-0364]
- Deutsche Forschungsgemeinschaft
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [910472] Funding Source: National Science Foundation
The longitudinal magnetic susceptibility of single crystals of the molecular magnet Mn(12)-acetate obeys a Curie-Weiss law, indicating a transition to a ferromagnetic phase at similar to 0.9 K. With increasing magnetic field applied transverse to the easy axis, a marked change is observed in the temperature dependence of the susceptibility, and the suppression of ferromagnetism is considerably more rapid than predicted by mean-field theory for an ordered single crystal. Our results can instead be fit by a Hamiltonian for a random-field Ising ferromagnet in a transverse magnetic field, where the randomness derives from the intrinsic distribution of locally tilted magnetic easy axes known to exist in Mn(12)-acetate crystals, suggesting that Mn12-acetate is a realization of the random-field Ising model in which the random field may be tuned by a field applied transverse to the easy axis.
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