engleski

Strong Cu-O hybridization in cuprate superconductors evidenced by NMR/NQR

The intracell charge distribution in La$_{; ; ; 2-x}; ; ; $Sr$_x$CuO$_4$, described in terms of the average hole number on copper sites $n_d$, is estimated from the measured $^{; ; ; 63}; ; ; \nu_Q$ frequencies. n_d$ and the slope $\partial n_d/\partial \delta$ are also calculated using the Emery three-band model for both $U_d \rightarrow \infty$ and $U_d = 0$ and for the single-particle parameters extracted from ARPES experiments. The large difference between two sets of estimated values for $n_d$ and $\partial n_d/\partial \delta$ is discussed in terms of the large $U_d$ limit of the three-band model. It appears that, through the coupling with CDW and charge transfer fluctuations, the spin density fluctuations strongly affect those and other properties of cuprates.

nuclear magnetic resonance

nije evidentirano