In SCR theory of 2D AF spin fluctuations at QCP (y0=0), y1=0.1 classifies χ(Q)(T) as Curie law for y1<0.1 versus Curie-Weiss/power-law for y1>0.1; lack of Curie-Weiss T identifies QCP for weak coupling.
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Staggered spin susceptibility at a two-dimensional antiferromagnetic quantum critical point
In SCR theory of 2D AF spin fluctuations at QCP (y0=0), y1=0.1 classifies χ(Q)(T) as Curie law for y1<0.1 versus Curie-Weiss/power-law for y1>0.1; lack of Curie-Weiss T identifies QCP for weak coupling.