We studied the effect of Ni incorporation on the magnetic properties of ${\mathrm{CeSbNi}}_x$ $(0\mathrm{}<~x<~0.35)$ using resistivity, susceptibility, and magnetization measurements under high pressure and magnetic field. With increasing pressure antiferromagnetic transition temperature ${(T}_N)$ of CeSb increases continuously leading to a high pressure phase. Similarly, $T_N$ of ${\mathrm{CeSbNi}}_x$ increases with pressure for $x<~0.15$ while increasing pressure weakens a Cr-like anomaly found in the resistivity of ${\mathrm{CeSbNi}}_{0.08}.$ Interestingly, resistivity of ${\mathrm{CeSbNi}}_{0.08}$ under higher pressure becomes very similar to that of CeSb at ambient pressure. Magnetic hysteresis, metamagnetic transition, and saturation behavior, which are absent in the ambient-pressure magnetization of ${\mathrm{CeSbNi}}_{0.05}$ and ${\mathrm{CeSbNi}}_{0.08},$ begin to appear with pressure too. On the other hand, pressure effects in both resistivity and magnetization of ${\mathrm{CeSbNi}}_{0.15}$ and ${\mathrm{CeSbNi}}_{0.35}$ are different from those of ${\mathrm{CeSbNi}}_{0.05}$ and ${\mathrm{CeSbNi}}_{0.08}.$ We discuss these findings with regard to possible Ni-induced changes in the nature of the magnetic interactions of CeSb.

• Received 8 May 2001

DOI:https://doi.org/10.1103/PhysRevB.65.014406