The hyperfine magnetic fields and the effect of high pressure on the magnetic transition temperatures of the noncentrosymmetric FeRhGe 2 compound (B20)

Hyperfine parameters and the pressure dependence of the magnetic transition temperatures of FeRhGe 2 have been investigated. Sample has been prepared using high pressure—high temperature synthesis technique. FeRhGe 2 consists of two B20 structure phases with close lattice constants. The phase separation stays constant in the temperature range 4–300 K. The magnetic transition temperatures T c 1 = 213 K and T c 2 = 135 K of FeRhGe 2 slightly increases with pressure in the range 0–4.5 GPa. We have compared this pressure dependence with some others compounds in the family Fe 1 − x Rh x Ge. The two phases in FeRhGe 2 have slightly different values of the hyperfine magnetic fields.