title: Downscaling Effect on the Superconductivity of Pd3Bi2X2 (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis.
abstract: Pd3Bi2S2 and Pd3Bi2Se2 have been successfully prepared in the form of nanoparticles with diameters of ∼50 nm by microwave-assisted modified polyol synthesis at low temperatures. The composition and morphology of the samples have been studied by means of powder X-ray diffraction as well as electron microscopy methods, including X-ray intensity mapping on the nanoscale. Superconducting properties of the as-prepared samples have been characterized by electrical resistivity measurements down to low temperatures (∼0.2 K). Deviations from the bulk metallic behavior originating from the submicrometer nature of the samples were registered for both phases. A significant critical-field enhancement up to 1.4 T, i.e., 4 times higher than the value of the bulk material, has been revealed for Pd3Bi2Se2. At the same time, the critical temperature is suppressed to 0.7 K from the bulk value of ∼1 K. A superconducting transition at 0.4 K has been observed in nanocrystalline Pd3Bi2S2. Here, a zero-temperature upper critical field of ∼0.5 T has been estimated. Further, spark plasma-sintered Pd3Bi2S2 and Pd3Bi2Se2 samples have been investigated. Their superconducting properties are found to lie between those of the bulk and nanosized samples.
authors: Department of Chemistry and Food Chemistry, Technische Universität Dresden , 01062 Dresden, Germany.
authors: Maria
authors: M
authors: Roslova
authors: Institute for Solid State Physics, Technische Universität Dresden , 01062 Dresden, Germany.|Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz Center Dresden-Rossendorf , 01314 Dresden, Germany.
authors: Lars
authors: L
authors: Opherden
authors: Max Planck Institute for Chemical Physics of Solids , 01187 Dresden, Germany.
authors: Igor
authors: I
authors: Veremchuk
authors: Institute for Solid State Physics, Technische Universität Dresden , 01062 Dresden, Germany.|Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz Center Dresden-Rossendorf , 01314 Dresden, Germany.
authors: Lena
authors: L
authors: Spillecke
authors: Institute of Physics, Humboldt University of Berlin , 12489 Berlin, Germany.
authors: Holm
authors: H
authors: Kirmse
authors: Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz Center Dresden-Rossendorf , 01314 Dresden, Germany.
authors: Thomas
authors: T
authors: Herrmannsdörfer
authors: Institute for Solid State Physics, Technische Universität Dresden , 01062 Dresden, Germany.|Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz Center Dresden-Rossendorf , 01314 Dresden, Germany.
authors: Joachim
authors: J
authors: Wosnitza
authors: Department of Chemistry and Food Chemistry, Technische Universität Dresden , 01062 Dresden, Germany.
authors: Thomas
authors: T
authors: Doert
authors: Department of Chemistry and Food Chemistry, Technische Universität Dresden , 01062 Dresden, Germany.|Max Planck Institute for Chemical Physics of Solids , 01187 Dresden, Germany.
authors: Michael
authors: M
authors: Ruck