##C=\frac{1}{N}\sum_{\vec{k}} \frac{J(0)}{J(0)-J(\vec{k})} ##(adsbygoogle = window.adsbygoogle || []).push({});

##J(\vec{k})## is exchange integral in ##\vec{k}## space. What is the name of this constant and where I can find more about it?

For simple cubic lattice

##C_{SC}=1.516##

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# Constant for different types of lattices

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