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無限層のニケラートにおける超伝導性

Danfeng Li1,2, Kyuho Lee3,4, Bai Yang Wang3,4

  • 1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA. denverli@stanford.edu.

Nature
|August 30, 2019
PubMed
まとめ

研究者は無限層のニケラートで 超伝導性を発見しました これは新種の材料です この発見は,銅酸化物と同様の新しい超伝導体の可能性を開き,高温超伝導性の探求を進めています.

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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 超伝導性

背景:

  • 銅酸化物の非伝統的な超伝導性 (例えば, (La,Ba) 2CuO4) は,同様の材料の研究を動機づけている.
  • Sr2RuO4やSr2IrO4のような同構造化合物は,超伝導特性またはシグネチャーを示すが,ゼロ抵抗状態は難解である.
  • 理論的研究と薄膜ヘテロ構造 (例えば,LaAlO3 / LaNiO3) は,人工のニッケラート超伝導体を探索しています.

研究 の 目的:

  • 銅酸化物と似た結晶と電子構造を持つ材料を調査することによって,新しい超伝導体を発見する.
  • 超伝導性のための人工的にレイヤリングされたニッケラートヘテロ構造の可能性を調査する.
  • 超伝導性の起源を理解するために

主な方法:

  • 柔らかい化学のトポタクシー還元を用いた無限層のニケラート単結晶薄膜 (NdNiO2とNd0.8Sr0.2NiO2) の合成
  • レジスティビティ測定による材料の特性.
  • 超伝導性を確認するために,臨界電流密度と磁場応答の分析.

主要な成果:

  • 超伝導性は,無限層のニケラート,Nd0.8Sr0.2NiO2で観察され,無限層の銅酸化物と同構造である.
  • Nd0.8Sr0.2NiO2は,超伝導的移行温度 (Tc) を9〜15ケルビンで示しています.
  • NdNiO2は,超伝導性Nd0.8Sr0.2NiO2とは異なり,低温で抵抗性の上昇を示した.

結論:

  • Nd0.8Sr0.2NiO2における超伝導性の発見は,ニッケラート超伝導体の新しい家族を確立する.
  • これらの発見は,ニッケラートと酸化銅の超伝導体間の潜在的な類似性を示唆しています.
  • 還元された層状ニッケラート結晶構造に関するさらなる研究は,追加の超伝導体を生成する可能性があります.