By undergoing Varma's phenomenological constraints a calculation of the optical conductivityσ(ω)in polaron model has been performed in order to interpret the infrared absorption features in high T_(c) supercondu...By undergoing Varma's phenomenological constraints a calculation of the optical conductivityσ(ω)in polaron model has been performed in order to interpret the infrared absorption features in high T_(c) superconductors.The temperature and phonon relaxation effects have been included.The agreement between our theoretical results and experiments is satisfactory.展开更多
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 li...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.展开更多
文摘By undergoing Varma's phenomenological constraints a calculation of the optical conductivityσ(ω)in polaron model has been performed in order to interpret the infrared absorption features in high T_(c) superconductors.The temperature and phonon relaxation effects have been included.The agreement between our theoretical results and experiments is satisfactory.
文摘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.
