A new aspect of the charge dynamics in layered metallic cuprates has b
een discovered in the study of the in-plane Hall coefficient (R(H)) in
La2-xSrxCuO4 over a wide temperature (4-500 K) and composition (0 < x
< 0.35) range. The strongly temperature dependent R(H), a hallmark of
cuprate superconductors, is found to be the low temperature part of a
simple functional form f(T/T) which becomes constant for T > T*. Thi
s form, followed for x greater-than-or-equal-to 0.15, has a characteri
stic temperature T which is high at the optimal composition (x = 0.15
) and decreases with increasing Sr concentration, similar to a tempera
ture scale deduced from magnetic susceptibility.