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We report the synthesis, crystal structure and characterization by means ofsingle crystal x-ray diffraction, neutron powder diffraction, magnetic, thermaland transport measurements of the new heavy fermion compoundsCe$_{2}$MAl$_{7}$Ge$_{4}$ (M = Co, Ir, Ni, Pd). These compounds crystallize ina noncentrosymmetic tetragonal space group P\={4}2$_{1}$m, consisting of layersof square nets of Ce atoms separated by Ge-Al and M-Al-Ge blocks.Ce$_{2}$CoAl$_{7}$Ge$_{4}$, Ce$_{2}$IrAl$_{7}$Ge$_{4}$ andCe$_{2}$NiAl$_{7}$Ge$_{4}$ order magnetically behavior below $T_{M}=$ 1.8, 1.6,and 0.8 K, respectively. There is no evidence of magnetic ordering inCe$_{2}$PdAl$_{7}$Ge$_{4}$ down to 0.4 K. The small amount of entropy releasedin the magnetic state of Ce$_{2}$MAl$_{7}$Ge$_{4}$ (M = Co, Ir, Ni) and thereduced specific heat jump at $T_M$ suggest a strong Kondo interaction in thesematerials. Ce$_{2}$PdAl$_{7}$Ge$_{4}$ shows non-Fermi liquid behavior, possiblydue to the presence of a nearby quantum critical point.

Investigation of the physical properties of the Ce2MAl7Ge4 (M = Co, Ir, Ni, Pd) heavy fermion compounds