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We study the galaxy populations in 74 Sunyaev Zeldovich Effect (SZE) selectedclusters from the South Pole Telescope (SPT) survey that have been imaged inthe science verification phase of the Dark Energy Survey (DES). The sampleextends up to $z\sim 1.1$ with $4 \times 10^{14} M_{\odot}\le M_{200}\le3\times 10^{15} M_{\odot}$. Using the band containing the 4000~\AA\ break andits redward neighbor, we study the color-magnitude distributions of clustergalaxies to $\sim m_*+2$, finding: (1) the intrinsic rest frame $g-r$ colorwidth of the red sequence (RS) population is $\sim$0.03 out to $z\sim0.85$ witha preference for an increase to $\sim0.07$ at $z=1$ and (2) the prominence ofthe RS declines beyond $z\sim0.6$. The spatial distribution of cluster galaxiesis well described by the NFW profile out to $4R_{200}$ with a concentration of$c_{\mathrm{g}} = 3.59^{+0.20}_{-0.18}$, $5.37^{+0.27}_{-0.24}$ and$1.38^{+0.21}_{-0.19}$ for the full, the RS and the blue non-RS populations,respectively, but with $\sim40$\% to 55\% cluster to cluster variation and nostatistically significant redshift or mass trends. The number of galaxieswithin the virial region $N_{200}$ exhibits a mass trend indicating that thenumber of galaxies per unit total mass is lower in the most massive clusters,and shows no significant redshift trend. The red sequence (RS) fraction within$R_{200}$ is $(68\pm3)$\% at $z=0.46$, varies from $\sim$55\% at $z=1$ to$\sim$80\% at $z=0.1$, and exhibits intrinsic variation among clusters of$\sim14$\%. We discuss a model that suggests the observed redshift trend in RSfraction favors a transformation timescale for infalling field galaxies tobecome RS galaxies of 2 to 3~Gyr.

Galaxy Populations in Massive Galaxy Clusters to z=1.1: Color Distribution, Concentration, Halo Occupation Number and Red Sequence Fraction