What is Spin Temperature? - Definition & Explanation

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Can you explain to me what is a spin temperature?what is it for? and if possible any reference that can help my understanding..

thanks,
kadas
 
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oh,damn, why don't I just googled it...sorry..but thanks, for link..
 
From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. Annihilated superfluid carriers become normal and lose their momenta on lattice atoms. So if we induce a persistent supercurrent in a ring below Tc and after that slowly increase the temperature, we must observe a decrease in the actual supercurrent, because the density of electron pairs and total supercurrent momentum decrease. However, this supercurrent...
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