Thermodynamic aspects of heavy fermion compounds under high pressure

High pressure studies on the thermal expansion and electrical resistance of the heavy fermion U-compound have been carried out to examine the electronic state under volume contraction. Clear anomalies around 17 K were found in the temperature dependence of the thermal expansion coefficient and electrical resistivity due to antiferromagnetic ordering. A T-2 dependence in electrical resistivity and T-linear term in the thermal expansion coefficient were obtained at low temperature. These results are analyzed on the basis of thermodynamic relations and discussed-by using volume-dependent Gruneisen parameter in comparison with the results for other concentrated Kondo compounds. (C) 1998 Published by Elsevier Science S.A.