Electrical resistivity measurements under high pressure for Nd_3.5Sm_0.5Ni₃O₈

抄録

Nd_3.5Sm_0.5Ni₃O₈ is a candidate for high-T_c superconductor, due to the close structural and electrical similarities with high-T_c cuprates. In electrical resistivity measurement, Nd_3.5Sm_0.5Ni₃O₈ shows a semiconducting behavior. However, by intercalation and subsequent deintercalation treatments with sulfur, Nd_3.5Sm_0.5Ni₃O₈ displays metallic behavior down to 20–40 K, followed by the weak semiconducting tendency at lower temperatures. In this study, the electrical resistivity measurements under high pressures up to 2 GPa were performed for a semiconducting sample of Nd_3.5Sm_0.5Ni₃O₈. We discuss the electrical properties of this material, combining the high-pressure resistivity data with measurements on metallic samples at ambient pressure.