Studies of superconductivity in U(Pt1-xPdx)3 for x<0.006

We report measurements of the specific heat and resistivity (T less than 1 K) for high quality polycrystals of U(Pt1-xPdx)(3) with x less than 0.006. The T-c-x phase diagram can be constructed, and superconductivity is destroyed for x similar to 0.006; this is approximately the same concentration above which the onset of large-moment antiferromagnetism is observed to occur. The splitting of the double superconducting transition increases smoothly with increasing Pd content, and is large enough that for Pd concentrations 0.004 less than x less than 0.006 only the superconducting A-phase will be present. (C) 1999 Elsevier Science B.V. All rights reserved.