Probing the phase diagram of CeRu_2Ge_2 by thermopower at high pressure

Details Probing the phase diagram of CeRu_2Ge_2 by thermopower at high pressure Probing the phase diagram of CeRu_2Ge_2 by thermopower at high pressure

2004-02-06

arxiv.org/abs/cond-mat/0402187v1

Phys. Rev. B 69, 214408 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.69.214408

The temperature dependence of the thermoelectric power, S(T), and the electrical resistivity of the magnetically ordered CeRu_2Ge_2 (T_N=8.55 K and T_C=7.40 K) were measured for pressures p < 16 GPa in the temperature range 1.2 K < T < 300 K. Long-range magnetic order is suppressed at a p_c of approximately 6.4 GPa. Pressure drives S(T) through a sequence of temperature dependences, ranging from a behaviour characteristic for magnetically ordered heavy fermion compounds to a typical behaviour of intermediate-valent systems. At intermediate pressures a large positive maximum develops above 10 K in S(T). 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 CeRu_2Ge_2.

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