Abstract
A systematic study of quasiparticle recombination and relaxation dynamics in ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ for $x=0.06$, 0.1, 0.115, 0.15, and 0.2 unambiguously shows the presence of two distinct components in the relaxation, one being present only below ${T}_{c}$ while the other vanishes at much higher temperatures. The two components are attributed to the intrinsically inhomogeneous ground state in cuprates. Since there are no charge reservoirs in the 2-1-4 system, the presence of two components can only be attributed to inhomogeneity of the $\mathrm{Cu}{\mathrm{O}}_{2}$ planes.
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