Tl2Ba2CuO6+deltaにおけるジョセフソン渦のインターレイヤーの画像
1K. A. Moler, Department of Physics, Princeton University, Princeton, NJ 08544, USA. J. R. Kirtley, IBM T. J. Watson Research Center, Post Office Box 218, Yorktown Heights, NY 10598, USA. D. G. Hinks and T. W. Li, Materials Science Division, Argonne Nat.
Science (New York, N.Y.)
|March 4, 1998
まとめ
研究者は,スキャニングSQUID顕微鏡を使用して,高温超伝導体内のインターレイヤジョセフソントンネリングを測定しました. 結果は,層間のトンネリングモデルによって予測されたより,層間の貫通の深さがかなり大きいことを示しました.
科学分野:
- 凝縮物質物理学 凝縮物質物理学
- 材料科学 材料科学とは
- 超伝導性は超伝導性である.
背景:
- 層間のジョセフソントンネリングは,層状の材料における超伝導性のメカニズムを理解するために重要です.
- 単一の酸化銅平面を持つ高トランジション温度超伝導体は,研究のためにユニークな性質を提供します.
研究 の 目的:
- Tl2Ba2CuO6+delta.でインターレイヤーのトンネリング強さを直接測定する.
- 高移行温度超伝導体における層間トンネリングモデルの有効性をテストするために.
主な方法:
- スキャニング超伝導量子干渉装置 (SQUID) 顕微鏡を使用しました.
- トンネリングを定量化するために,ジョセフソン渦のイメージされた中間層.
主要な成果:
- 層間の浸透深度 (lambdac) は,約20マイクロメートルと測定されました.
- この測定された深さは,層間トンネリングモデルによって予測された深さの約20倍です.
結論:
- この発見は,この材料における超伝導性の唯一のメカニズムとして,標準的な層間トンネリングモデルに異議を唱えている.
- 層間のトンネル掘削における観察された不一致を説明するために,さらなる理論的および実験的調査が必要である.
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