Cubic Laves ferromagnet TbNi₂Mn investigated through ambient-pressure magnetization and specific heat and high pressure ac magnetic susceptibility

TbNi₂Mn is a cubic Laves material, isostructural to TbNi₂, with the Mn sitting on both the Tb and the Ni lattice positions. It is ferromagnetic at ambient pressure at T_C=151 K and has been investigated in detail at ambient pressure through magnetization and specific heat with various applied magnetic fields. It displays Curie-Weiss behavior above T_C, with an effective moment of 8.43μ_B∕f.u., and isothermal magnetization at various temperatures is consistent with narrow domain walls. The low-temperature specific heat results in a linear contribution of 65 mJ∕mol K² and a Debye temperature of θ_D=188 K. The ac magnetic susceptibility has been investigated using designer diamond anvils up to 28.3 GPa. A magnetic anomaly at T^* is investigated as a function of both magnetic field and pressure, both of which have very little effect for fields less than the coercive force. The Curie temperature decreases at a rate of dT_C∕dP=−1.96 K∕GPa, and differences between hydrostatic and nonhydrostatic conditions are discussed.