title: The great effect of magnetic Fe(2+) ions on electromagnetic behavior in the Cu(1-x)Fe(x)Ir(2)S(4) system.
abstract: The substitution of magnetic Fe(2+) for nonmagnetic Cu(+) in the Cu(1-x)Fe(x)Ir(2)S(4) system causes drastic changes in electromagnetic behavior. For x = 0.01 and 0.025, the Peierls-like phase transition step ΔM in magnetization increases with x increasing, and an unexpected spin transition occurs at T(*)≈120 K. This may be attributed to the spin-polarization of the Ir(4+) ions by the Fe(2+) ions. When x exceed 0.1, the Peierls-like phase transition is suppressed completely. The magnetic state for Fe doped samples transforms from ferromagnetic (FM) to paramagnetic (PM), and back to the FM state again with the increase of x. For the highly doped samples, the FM domains formed by Fe(2+) ions result in another transition at T(**)≈110 K and the cluster-spin glass transition.
authors.affiliation: National High Magnetic Field Laboratory, University of Science and Technology of China, Hefei 230026, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Langsheng
authors.initials: L
authors.lastname: Ling
authors.forename: Shun
authors.initials: S
authors.lastname: Tan
authors.forename: Li
authors.initials: L
authors.lastname: Pi
authors.forename: Ning
authors.initials: N
authors.lastname: Liu
authors.forename: Yuheng
authors.initials: Y
authors.lastname: Zhang