We have synthesized a new superconductor ZnN y Ni 3 with T c ~3 K. The crystal structure has the same anti-perovskite-type such as MgCNi 3 and CdCNi 3. As far as we know, this is the third superconducting material in Ni-based anti-perovskite series. For this material, superconducting parameters, lower critical field H c1 (0), upper critical field H c2 (0), coherence length ξ(0), penetration depth λ(0), and Gintzburg -Landau parameter κ(0) have been experimentally determined.
Various ZnNyNi3−xCoxcompounds with differing Co content,x, were synthesized, and their magnetic properties were investigated. Uniform solid solutions could not be obtained at low Co content (x<0.75); instead micrometer-scaled ferromagnetic ZnNyNi0.6Co2.4domains formed embedded within a superconductive ZnNNi3bulk, showing chemical phase separation of superconductive ZnNNi3and ferromagnetic ZnNyNi0.6Co2.4. At intermediate levels of Co concentration (0.75<x<2), this two-phase separation might persist, and the superconductive behavior was strongly suppressed in this composition region. Only at high Co concentration (x>2) the uniform ferromagnetic solid solution ZnNyNi3−xCox(with most likelyy=0.5) formed. The phase separation behavior is intrinsic to the system, reflecting the existence of a miscibility gap in ZnNyNi3−xCoxfor the samples withx<2, and was shown not to be attributable to incomplete synthesis. In the two-phased samples, high-quality granular contact between the superconductor and ferromagnet has been realized, suggesting that the production of useful devices requiring high-quality contacts between superconductors and ferromagnets may be possible by making use of this two-phase situation.
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