Phase diagram of ${\mathrm{CeCu}}_2$(${\mathrm{Si}}_{1\mathrm{-}\mathit{x}}$${\mathrm{Ge}}_{\mathit{x}}$${)}_2$

The magnetic phase diagram of the system ${\mathrm{CeCu}}_2$(${\mathrm{Si}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Ge}}_{\mathit{x}}$ ${)}_2$ with 0≤x≤1 is studied by electrical transport, magnetic susceptibility, and neutron scattering measurements. The transition from heavy-fermion superconductivity in ${\mathrm{CeCu}}_2$ ${\mathrm{Si}}_2$ to the local moment type of antiferromagnetism in ${\mathrm{CeCu}}_2$ ${\mathrm{Ge}}_2$ is explored. The system reveals a rich phase diagram with up to three distinct transitions below 5 K. The nature of the phases is not fully resolved yet. © 1996 The American Physical Society.