Pressure-induced ferromagnetism with strong Ising-type anisotropy in YbCu2Si2
Abstract
We report dc magnetic measurements on YbCu2Si2 at pressures above 10 GPa using a miniature ceramic anvil cell. YbCu2Si2 shows a pressure-induced transition from the non-magnetic to a magnetic phase at 8 GPa. We find a spontaneous dc magnetization in the pressure-induced phase above 9.4 GPa. The pressure dependence of the ferromagnetic transition temperature TC and the spontaneous magnetic moment m0 at 2.0 K have been determined. The value of m0 in the present macroscopic measurement is less than half of that determined via Mossbauer experiment. The difference may be attributed to spatial phase separation between the ferromagnetic and paramagnetic phases. This separation suggests that the pressure-induced phase boundary between the paramagnetic and ferromagnetic states is of first order. Further, we have studied the magnetic anisotropy in the pressure-induced ferromagnetic state. The effect of pressure on the magnetization with magnetic field along the magnetic easy c-axis is much larger than for field along the hard a-axis in the tetragonal structure. The pressure-induced phase has strong Ising-type uniaxial anisotropy, consistent with the two crystal electric field (CEF) models proposed for YbCu2Si2.
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