A THEORETICAL INVESTIGATION FOR LOW-DIMENSIONAL MOLECULAR-BASED MAGNETIC-MATERIALS

A two-dimensional ferromagnetic Ising system composed of ferrimagnetic ally ordered chains with alternating spin- 1/2 and spin-S (S > 1/2) at oms ir; investigated by the use of Ising spin identities and the diffe rential operator technique, in order to clarify the magnetic propertie s of bimetallic molecular-based magnetic materials. The correlated eff ective-field approximation is used for the discussion. The numerical r esults of total magnetization M and inverse susceptibility chi(-1) are obtained and discussed for the two systems with S = 1 and S = 3/2. So me unexpected features are observed in the temperature dependences of chi(-1) when the crystal-held interaction constant d on a spin-S atom becomes negative, such as then on-divergence of the chi(-1) in the sys tems with d = -1.0.