Uniform susceptibility near an antiferromagnetic quantum critical point

We calculate the two-loop correction to the uniform susceptibility near a two-dimensional antiferromagnetic quantum critical point. Although the exponent is unchanged by the two-loop correction, the temperature dependence of the uniform susceptibility deviates from the form chi(T)(-1) = chi(0)(-1) + alpha T at high temperatures and is qualitatively consistent with the experimental result. (C) 2000 Elsevier Science B.V. All rights reserved.