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We report dc magnetic measurements on YbCu$_2$Si$_2$ at pressures above 10GPa using a miniature ceramic anvil cell. YbCu$_2$Si$_2$ shows apressure-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 9.4GPa. The pressure dependence of the ferromagnetic transition temperature T_Cand the spontaneous magnetic moment m_0 at 2.0 K have been determined. Thevalue of m_0 in the present macroscopic measurement is less than half of thatdetermined via Mossbauer experiment. The difference may be attributed tospatial phase separation between the ferromagnetic and paramagnetic phases.This separation suggests that the pressure-induced phase boundary between theparamagnetic and ferromagnetic states is of first order. Further, we havestudied the magnetic anisotropy in the pressure-induced ferromagnetic state.The effect of pressure on the magnetization with magnetic field along themagnetic easy $c$-axis is much larger than for field along the hard $a$-axis inthe tetragonal structure. The pressure-induced phase has strong Ising-typeuniaxial anisotropy, consistent with the two crystal electric field (CEF)models proposed for YbCu$_2$Si$_2$.

Pressure-induced ferromagnetism with strong Ising-type anisotropy in YbCu$_2$Si$_2$