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Realization of random-field dipolar Ising ferromagnetism in a molecular
magnet
release_36e3pmrntjgyfhrthzzwxkyisy
by
Bo Wen,
P. Subedi,
Lin Bo,
Y. Yeshurun,
M. P. Sarachik,
A. D. Kent,
C.
Lampropoulos,
G. Christou
Released
as a article
.
2009
Abstract
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 due to dipolar interactions. With increasing magnetic field
applied transverse to the easy axis, the transition temperature decreases
considerably more rapidly than predicted by mean field theory to a T=0 quantum
critical point. Our results are consistent with an effective Hamiltonian for a
random-field Ising ferromagnet in a transverse field, where the randomness is
induced by an external field applied to Mn_12-acetate crystals that are
known to have an intrinsic distribution of locally tilted magnetic easy axes.
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0910.1754v1
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