We argue that recently observed superconductivity-induced blue shift of the plasma frequency δωpl in Bi2Sr 2CaCu2O8+δ [Molegraaf et al., Science 295, 2239 (2002)] is related to the change in the integrated dynamical structure factor associated with the development of the spin resonance below T c. We show that the magnitude of δωpl is consistent with the small integrated spectral weight of the resonance, and its temperature dependences closely follow that of the spin-resonance peak. We also discuss the differential optical integral for the conductivity.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Sep 2004|