The introduction of a small volume fraction of &sgr;‐phase MoRu particles into an otherwise amorphous superconducting matrix of composition (Mo0.6Ru0.4)80Si10B10is observed to result in substantial flux‐pinning interactions and an increase of the sampleTc. The critical current density in the presence of an externally applied field is increased by two to three orders of magnitude as compared to that of the amorphous matrix alone. The proximity effect explains the observed increase ofTcwhich results from the &sgr;‐phase precipitate particles having aTchigher than that of the amorphous matrix.