Register to reply

The molecular field approximation

by matematikuvol
Tags: approximation, field, molecular
Share this thread:
matematikuvol
#1
Oct9-11, 04:10 PM
P: 192
MFA

[tex]\hat{A}\hat{B}\approx \hat{A}\langle\hat{B}\rangle+\hat{B}\langle\hat{A}\rangle-\langle\hat{A}\rangle\langle\hat{B}\rangle[/tex]

What this mean physically? What we neglect here?

If I calculate Neel temperature using this method [tex]T_N^{MFA}[/tex] and using RPA method [tex]T_N^{RPA}[/tex] is there some relation between those temperatures?
Phys.Org News Partner Physics news on Phys.org
Technique simplifies the creation of high-tech crystals
Working group explores the 'frustration' of spin glasses
New analysis of oxide glass structures could guide the forecasting of melt formation in planetary interiors
xiyangxixia
#2
Oct9-11, 10:55 PM
P: 6
mean-field approximation method
genneth
#3
Oct10-11, 08:06 AM
P: 981
Perhaps a natural way to see the decomposition is if A and B are fluctuations around some mean, i.e. <A> = <B> = 0. Then you just have AB ~ 0, i.e. you are neglecting correlated fluctuations in A and B.


Register to reply

Related Discussions
External Field Approximation Quantum Physics 4
Question on weak field approximation Special & General Relativity 9
Jefimenko B-field approximation Advanced Physics Homework 5
Question about the weak field approximation Special & General Relativity 18
The weak field approximation Special & General Relativity 3