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Realization of random-field Ising ferromagnetism in a molecular magnet

Bo Wen, P. Subedi, Lin Bo, Y. Yeshurun, M. P. Sarachik, A. D. Kent, A. J. Millis, C. Lampropoulos, G. Christou
2010 Physical Review B  

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2009 pre-print
arXiv:0910.1754v1 fatcat:36e3pmrntjgyfhrthzzwxkyisy
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
more » ... 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.
doi:10.1103/physrevb.82.014406 fatcat:ab35cimem5gwxmbdnfoedjmm7e
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Bo Wen, P. Subedi, Lin Bo, Y. Yeshurun, M. P. Sarachik, A. D. Kent, A. J. Millis, C. Lampropoulos, G. Christou. "Realization of random-field Ising ferromagnetism in a molecular magnet." Physical Review B 82.1 (2010)