Abstract
Filled skutterudite LaxRh4P12 has the highest superconducting transition temperature (Tc) of 17 K [1]. An analysis of superconducting parameters of LaxRh4P12 suggests that the relatively large the electron-phonon coupling constant λ among the ternary filled skutterudite-type phosphides is one of the reasons why it has high Tc. In this study, high-pressure electrical resistively measurements for LaxRh4P12 at x = 0.8 with Tc = 13.6 K using a piston cylinder device and a diamond anvil cell have been carried out up to 15 GPa. Tc decreases with applying pressure at a rate of -0.5 K/GPa. High-pressure x-ray diffraction measurements have also been performed up to 5 GPa. The value of B0 of 120 GPa is calculated from the x-ray data.
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