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Related Experiment Videos

Tetragonal SmBa2Cu3O7-x [x = 0.74(4)].

S Sato1, Y Kino, A Shibata

  • 1X-Ray Research Laboratory, Rigaku Corporation, 3-12-7 Matsubaracho, Akishima, Tokyo 196-8666, Japan. ss310@f2.dion.ne.jp

Acta Crystallographica. Section C, Crystal Structure Communications
|April 21, 2001
PubMed
Summary

Researchers synthesized samarium barium copper oxide crystals, finding they do not exhibit superconductivity. Structural analysis revealed a resemblance to tetragonal YBCO, with no significant atom mixing and a reduced oxygen occupancy in the CuO(2) planes.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Superconductivity Research

Background:

  • The 123 system, exemplified by Yttrium Barium Copper Oxide (YBCO), is a key class of high-temperature superconductors.
  • Investigating structural and compositional variations in related compounds is crucial for understanding superconductivity mechanisms.
  • Samarium Barium Copper Oxide (SmBCO) is structurally analogous to YBCO, making it a candidate for superconductive properties.

Purpose of the Study:

  • To synthesize single crystals of samarium barium copper oxide (SmBCO).
  • To investigate the crystal structure and physical properties, specifically superconductivity, of the synthesized SmBCO.
  • To compare the structural characteristics of SmBCO with those of tetragonal YBCO.

Main Methods:

Related Experiment Videos

  • Modified top-seeded solution-growth method for crystal preparation.
  • Low-temperature measurements down to 4.2 K to assess superconductivity.
  • X-ray diffraction and crystallographic analysis to determine structural resemblance and atomic site occupancy.
  • Bond-valence-sum calculations to verify site occupancy.

    • Main Results:

    • Single crystals of samarium barium copper oxide were successfully prepared.
    • The synthesized crystals exhibited no superconductivity at temperatures as low as 4.2 K.
    • Structural analysis indicated a close resemblance to tetragonal YBCO, with no detectable atom mixing at the Ba site.
    • Bond-valence-sum calculations confirmed the absence of samarium at the barium site.
    • A significantly reduced occupancy (0.13(2)) was observed at the oxygen site in the basal plane of the CuO(6) octahedron, consistent with the 123 system.
    • Small atomic displacement parameters for atoms in the CuO(2) plane and the samarium atom suggest a tightly packed structure around the samarium atom.

    Conclusions:

    • Samarium barium copper oxide crystals, as prepared, do not display superconductivity.
    • The crystal structure is highly ordered and similar to tetragonal YBCO, with distinct site occupancies.
    • The reduced oxygen occupancy in the CuO(2) plane is a characteristic feature, similar to other 123 compounds.
    • The structural findings provide insights into the relationship between composition, structure, and superconductivity in related copper oxide systems.