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A series of single-phased La(Pt 1-x Au x ) 4 Ge 12 compounds were prepared by an arc-melting method. The crystal structure and basic superconductivity parameters have been systematically investigated by X-ray diffraction and by examining the temperature and field dependences of electrical resistivity, magnetization and heat capacity. The lattice parameter a increases and the superconducting transition temperature T c decreases gradually with increasing Au content x. The low critical field H c1 (T) and the upper critical field H c2 (T) were estimated from the isothermal magnetization (M-H-T) and electrical transport (p-H-T) measurements, respectively. The evaluated H c1 (0) and H c2 (0) indicate a decrease tendency with increasing x, and enable us to deduce the coherence length ξ(0), penetration depth λ(0), Ginzburg-Landau parameter κ(0) and thermodynamic critical field H c (0). The present results are compared with those of the related systems.

materials transactions

Gold Substitution Effect on Structure and Superconductivity Properties in Filled Skutterudite La(Pt&lt;SUB&gt;1&amp;minus;&lt;I&gt;x&lt;/I&gt;&lt;/SUB&gt;Au&lt;I&gt;&lt;SUB&gt;x&lt;/SUB&gt;&lt;/I&gt;)&lt;SUB&gt;4&lt;/SUB&gt;Ge&lt;SUB&gt;12&lt;/SUB&gt;