Universal Superconducting Ground State in Nd1.85Ce0.15CuO₄ and Nd₂CuO₄

DOI DOI Web Site Web Site Web Site 被引用文献6件 参考文献34件 オープンアクセス

書誌事項

タイトル別名
  • Centennial Anniversary of Superconductivity ; SELECTED TOPICS IN APPLIED PHYSICS
公開日
2012-01
資源種別
journal article
DOI
  • 10.1143/jjap.51.010106
  • 10.7567/jjap.51.010106
公開者
Tokyo : The Japan Society of Applied Physics

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説明

<jats:p> Superconducting Nd<jats:sub>1.85</jats:sub>Ce<jats:sub>0.15</jats:sub>CuO<jats:sub>4</jats:sub> (<jats:italic>T</jats:italic> <jats:sub>c</jats:sub> <jats:sup>zero</jats:sup> = 24 K) and Nd<jats:sub>2</jats:sub>CuO<jats:sub>4</jats:sub> (<jats:italic>T</jats:italic> <jats:sub>c</jats:sub> <jats:sup>zero</jats:sup> = 25 K) thin films have been grown by molecular beam epitaxy and their magneto-transport and structural properties have been investigated. The as-grown films are insulators irrespective of the substitution level, and superconductivity is induced after the samples are treated by an annealing process under reducing atmospheres. Though the metallic conductivity is higher in the Ce<jats:sup>4+</jats:sup> substituted sample, the superconducting properties are quite similar between Ce<jats:sup>4+</jats:sup> substituted and substitution-free samples. A similar upper critical magnetic field as well as a similar superconducting transition temperature of Nd<jats:sub>1.85</jats:sub>Ce<jats:sub>0.15</jats:sub>CuO<jats:sub>4</jats:sub> and Nd<jats:sub>2</jats:sub>CuO<jats:sub>4</jats:sub> shows that the addition of electrons merely influences the superconducting state. Consequently, the appearance of an antiferromagnetic Mott insulating state solely depends on the annealing process, not on the electron doping or cerium substitution level. </jats:p>

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