Preparation and characterisation of Os doped MgB2

Jean-Claude Grivel, Shahla Namazkar, Aikaterini Alexiou, Olfert Joakim Holte

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Polycrystalline samples with Mg1-xOsxB2.04 nominal stoichiometry were made by reacting elemental powders at 800 °C under argon atmosphere. Based on XRD diffraction patterns, EDS analysis and magnetisation measurements, it is found that Os can replace up to about 1 at.% Mg in the MgB2 lattice. Beyond this doping level, unreacted Os and Mg-rich Mg-Os impurity phases are formed. The a-axis parameter contracts upon doping while the superconducting transition temperature decreases at a rate of 2.1 K/at.% Os substitution. At 10 K, Os doping induces an improvement of the normalised critical current density under applied magnetic fields in excess of 0.5 T, indicating a modest enhancement of flux pinning in this range.
Original languageEnglish
JournalPhysica C: Superconductivity and its Applications
Volume507
Pages (from-to)70-74
Number of pages5
ISSN0921-4534
DOIs
Publication statusPublished - 2014

Keywords

  • Doping
  • MgB2
  • Osmium
  • Doping (additives)
  • Magnesium
  • Superconducting transition temperature
  • Applied magnetic fields
  • Argon atmospheres
  • Doping levels
  • EDS analysis
  • Elemental powders
  • Impurity phasis
  • Polycrystalline samples

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