High-pressure effect on superconducting state of thorium metal

Here we report pressure studies on thorium metal by electrical resistivity in the normal and in the superconducting state. We determined T-c(p) diagram and critical field H-c(T) up to 13GPa and down to 0.4K. We observe a decrease in T-c and H-c with the pressure applied. We confirm the change of regime around 10GPa. But we observe a different behavior of superconducting state versus pressure than previously reported. (c) 2006 Elsevier B.V. All rights reserved.