摘要
One of the most common and prominent optical feat ures of high temperture supeconductors ig the quadratic frequency dependence of the loss function,i e.,lm(-1/ε)=βω^(2),for hw≤1eV.We show that the nesting Fermi liquid(NFL)theory can quantitatively account for the low frequency(<0.5eV)behavior,but it cant not explain the higher frequency behavior.This suggests that the form of relaxation rate derived from the NFL is inadequate to describe the high frequency behavior in high temperature superconductors.
