Superconducting and Magnetically Ordered Systems

This Report covers the period of grant F49620-97-1-0297, from April 1, 1997 to September 30, 2000. The major research findings include (a) determination of the exotic magnetic and superconducting behavior of Sr2YRuO6, (b) discovery of coexistence of ferromagnetism and superconductivity in RuSr2GdCu2O8, (c) determination of the correct expression for the strong-collision Lorentzian in fast fluctuations or high fields, (d) measurement of correlation lengths in the disordered magnetic alloys CeNi(1-x)Cu(x)Sn, (e) a study of the vortex-core structure of superconducting YBCO done with muon spin rotation, (f) preparation for publication of muonSR studies of rare earth and actinide magnetism in the Handbook on the Physics and Chemistry of Rare Earths, (g) a study of spin dynamics and freezing in magnetic rare-earth quasicrystals, and (h) a study of non-Fermi-liquid metallic Ce7Ni3.