Probing the phase diagram ofCeRu2Ge2by thermopower at high pressure

The temperature dependence of the thermoelectric power, $S\left(T\right)$, and the electrical resistivity of the magnetically ordered $\mathrm{Ce}{\mathrm{Ru}}_2{\mathrm{Ge}}_2$ ($T_N=8.55\mathrm{K}$ and $T_C=7.40\mathrm{K}$) were measured for pressures $p<16\mathrm{GPa}$ in the temperature range $1.2\mathrm{K}<T<300\mathrm{K}$. Long-range magnetic order is suppressed at $p_c\approx 7.8\mathrm{GPa}$. Pressure drives $S\left(T\right)$ through a sequence of temperature dependences, ranging from a behavior characteristic for magnetically ordered heavy fermion compounds to a typical behavior of intermediate-valent systems. At intermediate pressures a large positive maximum develops above $10\mathrm{K}$ in $S\left(T\right)$. Its origin is attributed to the Kondo effect and its position is assumed to reflect the Kondo temperature $T_K$. The pressure dependence of $T_K$ is discussed in a revised and extended $(T,p)$ phase diagram of $\mathrm{Ce}{\mathrm{Ru}}_2{\mathrm{Ge}}_2$.