Specific heat, magnetization, and electrical resistivity have been studied on single crystalline samples of ${\mathrm{Ce}}_2{\mathrm{Pt}}_2\mathrm{Pb}$. These results clearly indicate that ${\mathrm{Ce}}_2{\mathrm{Pt}}_2\mathrm{Pb}$ undergoes an antiferromagnetic transition at approximately 3.4 K under a zero magnetic field. The magnetic field induces another ordered phase when the field is applied along the $\langle 100\rangle$ or $\langle 110\rangle$ directions of the crystallography, whereas we have not found another ordered phase along the $\langle 001\rangle$ direction of the field. The specific heat and the magnetization along three directions of the field reveal an easy-plane type magnetic anisotropy even in the antiferromagnetic phase. The magnetic structures of the ordered phases are discussed from the standpoint of macroscopic measurement, which results in a helical magnetic structure as a reasonable scenario. A large Sommerfeld coefficient of the specific heat and squared-temperature dependence of the electrical resistivity strongly suggest construction of the heavy-fermion state in ${\mathrm{Ce}}_2{\mathrm{Pt}}_2\mathrm{Pb}$, while the influence of the frustration is hardly found.

• Received 3 August 2017
• Revised 22 June 2018

DOI:https://doi.org/10.1103/PhysRevB.98.035131