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Single crystals of CeGe and its non-magnetic analogue LaGe have been grown byCzochralski method. CeGe compound crystallizes in the orthorhombic FeB-typecrystal structure with the space group \textit{Pnma} (#62). The anisotropicmagnetic properties have been investigated on well oriented single crystals bymeasuring the magnetic susceptibility, electrical resistivity and heatcapacity. It has been found that CeGe orders antiferromagnetically at 10.5 K.Both transport and magnetic studies have revealed large anisotropy reflectingthe orthorhombic crystal structure. The magnetization measurement measured at 2K revealed metamagnetic transitions along the [010] direction at 4.8 and 6.4 Tand along [100] direction at a critical field of 10.7 T, while themagnetiztaion along [001] direction was increasing linearly without any anomalyup to a field of 16 T. From the magnetic susceptibility and the magnetizationmeasurements it has been found that [010] direction is the easy axis ofmagnetization. The electrical resistivity along the three crystallographicdirections exhibited an upturn at $T_{\rm N}$ indicating the superzone gapformation below $T_{\rm N}$ in this compound. We have performed the crystallineelectric field (CEF) analysis on the magnetic susceptibility and the heatcapacity data and found that the ground state is doublet and the splittingenergies from the ground state to the first and second excited doublet stateswere estimated to be 39 and 111 K, respectively.

Anisotropic magnetic properties and superzone gap formation in CeGe single crystal