Relation between gap and order in spin model

navigator · Apr 23, 2008

what is the definition of spin gap?I may have ever heard a conclusion that spin gap will not exist while the system present long range order(right?),but the system of XXZ model in external field could stay in ferromagnetic phase,and have a long range order with a gapped excitation.why?

navigator · May 4, 2008

One more question appended.What is the order parameter of XXZ chain model in external field to distinguish between XY phase and ferromagnetic phase? Magnetization? but order parameter has a value of 0 for disorder phase,value of 1 for complete order phase...

Relation between gap and order in spin model

Discussion

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Relation between gap and order in spin model

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