Low-temperature antiferromagnetic order of Ni_4 single-molecule magnets  

作　　者：ZUO JunWei LIU HaiQing LI YanRong SU ShaoKui WANG YunPing 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第1期11-13,共3页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Science Foundation of the Chinese Academy of Sciences (Grant No. KJCX2-SW-W20);the National Basic Research Program of China (Grant No. 2011CB921702)

摘　　要：The low-temperature specific heat of Ni4 single-molecule magnets (SMMs) is measured in a PPMS He-3 system. The tem- perature-dependent specific heat of Ni4 SMMs shows an antiferromagnetic phase transition at 0.91 K. The experimental results are in good consistency with Monte Carlo simulation of 3D-Ising model, indicating two independent diamond-like antiferro-magnetic structures with an exchange energy J = 0.020 K in Ni4 system.The low-temperature specific heat of Ni4 single-molecule magnets （SMMs） is measured in a PPMS He-3 system. The tem- perature-dependent specific heat of Ni4 SMMs shows an antiferromagnetic phase transition at 0.91 K. The experimental results are in good consistency with Monte Carlo simulation of 3D-Ising model, indicating two independent diamond-like antiferromagnetic structures with an exchange energy J= 0.020 K in Ni4 system.

关 键 词：SMMs ANTIFERROMAGNET ISING Monte Carlo 

分 类 号：O482.5[理学—固体物理] TM27[理学—物理]