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We report the physical properties and electronic structure calculations of alayered chromium oxypnictide, Sr$_2$Cr$_3$As$_2$O$_2$, which crystallizes in aSr$_2$Mn$_3$As$_2$O$_2$-type structure containing both CrO$_2$ planes andCr$_2$As$_2$ layers. The newly synthesized material exhibits a metallicconduction with a dominant electron-magnon scattering. Magnetic andspecific-heat measurements indicate at least two intrinsic magnetic transitionsbelow room temperature. One is an antiferromagnetic transition at 291 K,probably associated with a spin ordering in the Cr$_2$As$_2$ layers. Anothertransition is broad, occurring at around 38 K, and possibly due to ashort-range spin order in the CrO$_2$ planes. Our first-principles calculationsindicate predominant two-dimensional antiferromagnetic exchange couplings, andsuggest a KG-type (i.e. K$_2$NiF$_4$ type for CrO$_2$ planes and G type forCr$_2$As$_2$ layers) magnetic structure, with reduced moments for both Crsublattices. The corresponding electronic states near the Fermi energy aremostly contributed from Cr-3$d$ orbitals which weakly (modestly) hybridize withthe O-2$p$ (As-4$p$) orbitals in the CrO$_2$ (Cr$_2$As$_2$) layers. The barebandstructure density of states at the Fermi level is only $\sim$1/4 of theexperimental value derived from the low-temperature specific-heat data,consistent with the remarkable electron-magnon coupling. The title compound isargued to be a possible candidate to host superconductivity.

Physical properties and electronic structure of Sr$_2$Cr$_3$As$_2$O$_2$ containing CrO$_2$ and Cr$_2$As$_2$ square-planar lattices