Dynamics of Single Molecular Magnet 2d-networks with frustration

In order to realize the 2d -spin ice system，we synthesized layered single molecular magnet (SMM) networks [Mn(5-Rsaltmen)]4[M(CN)6]A·nh_2o (M=Mn, Fe, Co； R=H, Me；A = cplo_4 ^-, PF6^-, cf_3 so_3 ^-), and measured the magnetic properties，in particular analyzing the magnetic relaxation. From the results，我们发现M=Mn是一个结构复杂的系统，and the relaxation model is the Davidson-Cole type indicating that the system is spin ice-like. theorigin of the frustration is a competition between the orthogonally oriented two uniaxial axes ofthe single molecular magnet unit and the ferromagnetic interaction between the SMM unit and the Mcomplex in 2d plane.我们也观察了一个disorder introduced system (M = Mn1- _xfe_x)，the spin ice state of x=0 is melted for x=0.1 and ordered into a randomly frozen state for x>0.3. Inaddition， the relation between the结构和magnetic properties is studied for various M，R, and A。

In order to realize the 2D-spin ice system, we synthesized layered single molecular magnet (SMM) networks [Mn(5-Rsaltmen)]4 [M(CN)6]A・nH_2O（M=Mn, Fe, Co; R=H, Me; A = ClO_4^-, PF6^-, CF_3SO_3^-）, and measured the magnetic properties, in particular analyzing the magnetic relaxation. From the results, we found that the system with M=Mn is a strongly frustrated system, and the relaxation model is the Davidson-Cole type indicating that the system is spin ice-like. The origin of the frustration is a competition between the orthogonally oriented two uniaxial axes of the single molecular magnet unit and the ferromagnetic interaction between the SMM unit and the M complex in 2D plane. We also observed that for a disorder introduced system (M = Mn1-_xFe_x), the spin ice state of x=0 is melted for x=0.1 and ordered into a randomly frozen state for x>0.3. In addition, the relation between the structure and the magnetic properties is studied for various M, R, and A.