Magnetic phase transitions inCeRh2Si2:Specific heat, susceptibility, and resistance studies

Two phase transitions near 35 and 24 K can be detected in the specific heat, susceptibility, and resistivity of ${\mathrm{CeRh}}_2{\mathrm{Si}}_2.$ We interpret the 35 K transition as magnetic ordering in a ($\frac{1}{2}$ $\frac{1}{2}$ $\frac{1}{2}$) structure. The much weaker transition near 24 K corresponds to the development of domains having a ($\frac{1}{2}$ $\frac{1}{2}$ 0) magnetic structure that grow spatially at the expense of the ($\frac{1}{2}$ $\frac{1}{2}$ $\frac{1}{2}$) structure. This interpretation of the magnetic phase diagram of ${\mathrm{CeRh}}_2{\mathrm{Si}}_2$ clarifies a controversy surrounding observations by neutron diffraction.