The ternary compound Pd2YSn crystallizing in the cubic Heusler (L2l) structure is superconducting with a superconducting transition temperature (T,) of 4.55 K. The superconducting and magnetic phase diagram of the pseudoternary system Pd2Yl "Dy Sn (x =0 -1) has been investigated.The superconducting T, of Pd2YSn decreases with the replacement of Y by Dy and superconductivity is completely suppressed at a critical concentration of Dy corresponding to x-0.35. The samples with x &0.5 are antiferromagnetically ordered with Neel temperatures ranging from 5 I( for x =0.5 -15 K for x =1.0 (Pd2DySn). The superconducting samples with x &0 show reentrant behavior under external applied fields. The temperature dependence of the upper critical field in Pd2Yl "Dy"Sn (x =0. 0, 0.1, and 0.15) has been measured and is analyzed in terms of the W'erthamer-Helfand-Hohenberg theory including the pair-breaking effects due to paramagnetic rare-earth ions.
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