Imperfect nesting and scattering due to disorder in spin-density-waves

Abstract

As is well-known both imperfect nesting and scattering reduces the spin-density-wave transition temperature and the quasi-particle energy gap at T=0 K. We extend our earlier analysis to the condensate density f 1 and the pinning potential thus the threshold field, at both T=0 K and T=T c when both imperfect nesting and scattering effect are present. At T=0 K, f 1 =1 in the presence of both imperfect nesting and scattering until the quasi-particle energy gap is closed. Consequently, the threshold field E T is almost constant until SDW is almost destroyed, where E T suddenly moves up. We found that E T exhibits a small peak just before T c for small scattering rates. This result may help disentangle the mechanism behind the rapid cooling of (TMTSF) 2 ClO 4