Realization of transverse-field Ising ferromagnet in molecular cluster

Transverse field Ising ferromagnetism in Mn12-acetate-MeOH.
P. Subedi, A. D. Kent, Bo Wen, M. P. Sarachik, Y. Yeshurun, A. J. Millis, S. Mukherjee, and G. Christou
Phys. Rev. B 85, 134441 (2012)

The change in inverse susceptibility normalized to the susceptibility at zero field versus H2⊥ for Mn12-ac-
MeOH (green dots, open circle Ref. 21) and Mn12-ac (red squares, half filled, and solid squares are sample A and B in Ref. 16) at T = 3.2 K. The red dashed line is calculated using the random-field model of Ref. 16 (RFIFM) for the root-mean-square tilt angle of 1.8◦. The solid green line shows the result for the case with no tilt angle (TFIFM).