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The lattice constants of ZrNiAl type α-CePdZn and TiNiSi type β-CePdZn were measured at high pressure up to 14 GPa at room temperature using X-ray diffraction (XRD) and a diamond anvil cell. The pressure dependence of lattice constants and volume of α-CePdZn were found to be smooth without any discontinuity, and having a bulk modulus, B 0 , and its pressure derivative, B 0 ′, of 67 GPa and 5.1, respectively. On the other hand, the a and b axes as well as volume of β-CePdZn were found to show anomalous pressure dependence at around 8 GPa. B 0 and B 0 ′ of β-CePdZn were 90 GPa and 2.1, respectively. These results suggest that a crossover in the electronic states is induced by applying pressure to β-CePdZn. The origins of these anomalous behaviors are discussed in connection with crossover and change in the topology of Fermi surface. [ABSTRACT FROM AUTHOR]

A new hybrid ruthenate–cuprate superconductor RuSm1.4Ce0.6Sr2Cu2O10 was synthesized. This compound also exhibits magnetic ordering around 130 K. Electrical resistance measurement under high pressure has been carried out in order to clarify the interplay between magnetism and superconductivity. It is found that Tc increases but the magnetic ordering temperature decreases with pressure, i.e., the superconductivity competes with magnetic ordering. [Copyright &y& Elsevier]