Pressure and Field Dependence of Critical Temperature on Superconductivity of Filled Skutterudite YRu₄P₁₂

Abstract

We report the pressure dependence of critical temperature on superconductivity (T c) of a filled skutterudite YRu 4 P 12 by measuring magnetization and resistivity up to 2.4 GPa and 8.0 GPa, respectively. We found that T c is almost independent to pressure up to 2.4 GPa and it shows a gradual decrease in the pressure range of 4.0 to 8.0 GPa. The pressure derivative of T c (dT c /dP) is-0.3 K/GPa in maximum and it is quite different from the (dT c /dP) ∼ 1.0 K/GPa of YFe 4 P 12. This study experimentally clarified the negative pressure dependence of YRu 4 P 12 , which was predicted based on a full potential linearized augmented plane wave calculation. In addition, we report the magnetic field dependence of T c of YRu 4 P 12 shows µ 0 H c2 (0) ∼ 3.2 T which is lower than the Pauli limiting field of ∼ 14 T and suggests that YRu 4 P 12 is a BSC-type superconductor.