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We report the design, synthesis, crystal structure, and physical propertiesof a layered intergrowth compound, Eu$_2$CuMn$_2$P$_3$. The structure ofEu$_2$CuMn$_2$P$_3$ features an alternating arrangement of hexagonal EuCuPblock layers and trigonal EuMn$_2$P$_2$ block layers, interconnected throughshared Eu planes. This structural hybridization leads to multiple magneticorderings in Eu$_2$CuMn$_2$P$_3$: weak antiferromagnetic (AFM) ordering of Mnat $T_\mathrm{N}^\mathrm{Mn}$ = 80 K, AFM ordering of Eu at$T_\mathrm{N}^\mathrm{Eu}$ = 29 K, a spin-reorientation transition at$T_\mathrm{SR}$ = 14.5 K, and weak ferromagnetism below$T_\mathrm{N}^\mathrm{Mn}$. The spin configurations at different temperatureregions were discussed based on the calculations of magnetic energies forvarious collinear arrangements. Resistivity measurements reveal a pronouncedtransition peak at $T_\mathrm{N}^\mathrm{Eu}$, which is suppressed in thepresence of a magnetic field, resulting in a significant negativemagnetoresistance effect. The computed semimetallic band structure,characterized by a small density of states at the Fermi level, aligns well withexperimental observations. The successful synthesis of Eu$_2$CuMn$_2$P$_3$ andits fascinating magnetic properties highlight the effectiveness of ourblock-layer design strategy. By assembling magnetic block layers of compoundswith compatible crystal symmetries and closely matched lattice parameters, thisapproach opens exciting avenues for discovering layered materials with uniquemagnetic behaviors.

Structural design and multiple magnetic orderings of the intergrowth compound Eu$_2$CuMn$_2$P$_3$