News Nanogallery
TODAY MARCH 20, 2023

Iron based superconducting wires

Iron based superconducting wires Since the discovery of iron-based superconducting materials by Rotter, Tegel, and Johrendt [PRL, 101, 107006 (2008)] the search for potential applications of these new superconductors continues to intensify. One of the promising materials of this class is FeSe, which has a relatively low toxicity and the critical temperature, Tc, of the superconducting transition of about 8 K. The Tc of this compound increases up to 37 K at high pressure. Thus it should be possible to increase the Tc of this compound very significantly by preparing a thin film or a nanowire with high internal stress. Recently a Japanese group lead by Y. Takano achieved some success in this direction. They made quenched superconducting wires with Tc increased up to 10 K. The critical current density was also improved. To fabricate such wires a Fe tube was packed with Se powder and then was drawn down to the diameter of 1 mm. Such wires were sealed in a quartz tube under pure Ar atmosphere. Then the sample was annealed at 800C for 2 hours. The quenching was done by removing the wires from the furnace and cooling them quickly at room temperature.

On the figure: Four different samples have been prepared and measured. The samples have been made by slow-heating and furnace-cooling (W1), rapid-heating and furnace-cooling (W2), slow-heating and quenching (W3), and rapid-heating and quenching (W4). The quenched sample W4 showed superior superconducting characteristics.

Iron based superconducting wires

  All news
Related news:
  • Perlmutter, Riess, and Schmidt receive the 2011 physics Nobel for the discovery of the accelerating and expanding universe
  • Long-term study shows students must know about numbers at beginning of first grade
  • Where exactly modern humans come from?
  • APS uncritical support to human-caused Global Warming Hypothesis causes resignation
  • Brain gene expression changes with experience
  • Single molecules can be used as perfect templates or scaffolds for metal deposition. 
For example, it is possible to decorate a single nanotube with a film of amorphous metal and produce a homogeneous nanowire of width in the range 5-10 nm.
    Nanowerk Nanotechnology Portal



    Nano-news | Nanosuperconductors | Nanofabrication | Nanophenomena | Journals | Web directory | contacts

    20042012 Copyright by
    Design by UpMrk