Systematic Study on the Critical Amplitude Γ for the Classical n-Vector Model in the High-Temperature Expansion

Abstract

We have studied the susceptibility critical amplitude Γ for the classical n-vector model in the high-temperature expansion. With the help of the Pade approximant, we have shown the smooth and monotonic n-dependence of the amplitude for the simple cubic, the body-centered cubic and the face-centered cubic lattices. The results are compared with the exact results for n=∞.