Heisenberg Feromagnet: Chaotic Phases @ Low Temp

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Petar Mali
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What is approximation of the chaotic phases for Heisenberg feromagnet in
low temperatures?
 
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Petar Mali said:
What is approximation of the chaotic phases for Heisenberg feromagnet in
low temperatures?

I don't know is it Bloch approximation or
maybe Holstein–Primakoff representation? And some
explanation about name approximation of the chaotic phases?