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Constant for different types of lattices 
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#1
Jan1914, 08:53 AM

P: 316

##C=\frac{1}{N}\sum_{\vec{k}} \frac{J(0)}{J(0)J(\vec{k})} ##
##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## 


#2
Jan2114, 02:19 AM

P: 669

Can you provide a bit more context?
Exchange integrals usually depend on details of the band structure, so I am surprised that you can get a universal constant for all simple cubic lattices irrespective of lattice constant, atomic flavor etc. J(0) would favor ferromagnetism J(k) with k != 0 would favor antiferromagnetism with a modulation wave vector k. 


#3
Jan2114, 03:07 AM

P: 316

See this paper.



#4
Jan2114, 03:23 AM

P: 316

Constant for different types of lattices
Or here.



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