INTERPLANE CHARGE DYNAMICS IN LA2-XSRXCUO4

We present c-axis polarized optical spectrum sigma(c)(omega) and out-of-plane Hall coefficient (R(H)c) in the normal state of La2-xSrxCuO4 as a function of doping. While sigma(c)(omega) is dominated by a Drude-like peak at omega = 0 and R(H)c has finite negative values in the overdoped region, the low-energy sigma(c)(omega) severely suppressed and nearly omega independent, and R(H)c is very small for underdoped compounds. The results provide evidence for different charge dynamics normal to the planes and clearly demonstrate how the charge dynamics changes with doping.