Condensed Matter Physics,
1997, No 9, p. 57-87, English <BR>
<A HREF="https://doi.org/10.5488/CMP.9.57"> DOI:10.5488/CMP.9.57</A>


<HR>
<B>Title: </B>TWO-PARTICLE CLUSTER APPROXIMATION FOR ISING TYPE MODEL WITH 
ARBITRARY VALUE OF SPIN. CORRELATION FUNCTIONS OF BLUME-EMERY-GRIFFITHS MODEL
<BR>

<B>Authors: </B>S.I.Sorokov, R.R.Levitskii, O.R.Baran (Institute for 
Condensed Matter Physics of the Ukrainian National Academy of Sciences, 1 
Svientsitskii St., UA-290011 Lviv-11, Ukraine) 
<p>
<blockquote>
The Ising type model with arbitrary value of spin is investigated within the 
two-particle cluster approximation. For this model on hypercubic lattices 
the expressions for the pair correlation functions in q-space are obtained. 
For Blume-Emery-Griffiths model (S=1) on a simple cubic lattice with 
bilinear K, biquadratic K' interactions and single-ion anisotropy D, a 
projection of the phase diagram on D/K-K'/K plane is constructed. The 
temperature dependences of &lt;S^z&gt;, &lt;(S^z)^2&gt; and pair 
correlation functions 
at q=0 are calculated at various values of parameters D/K and K'/K.
</blockquote>
<B>Comments: </B>Figs. 26, Refs. 25, Tabs. 0.<BR>
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