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Force free strain exerted on a YBCO layer at 77 K in surround Cu stabilized YBCO coated conductors

銅安定化YBCO被覆導体のYBCO層に作用する77Kにおけるforce free strain

長村 光造*; 町屋 修太郎*; 土屋 佳則*; 鈴木 裕士

Osamura, Kozo*; Machiya, Shutaro*; Tsuchiya, Yoshinori*; Suzuki, Hiroshi

幅4mmのCu安定化YBCO被覆導体テープを用いて、YBCO被覆導体の臨界電流に対する応力ひずみの影響を評価した。中性子回折を用いて、YBCO層に作用する内部ひずみを77Kという低温環境において決定した。初期の圧縮ひずみは引張荷重作用下で減少し、YBCO層における内部応力がゼロとなるforce-free strain(A$$_{rm ff}$$)で引張成分に変化した。A$$_{rm ff}$$は77Kで0.19-0.21%であった。一方、77Kで単軸引張荷重下における臨界電流を測定した結果、そのひずみ依存性は特徴的な挙動を示すとともに、臨界電流は0.035%で極大を示した。これは上記A$$_{rm ff}$$の値とは大きく異なっており、最大臨界電流の得られるひずみはA$$_{rm ff}$$とは相関を有しないことが明らかとなった。

The stress/strain behavior of the surround Cu stabilized YBCO coated conductors and its influence on critical current were precisely investigated. The internal strain exerted on the superconducting YBCO layer was determined at 77 K by using a neutron diffraction technique at JAEA. The initial compressive strain decreased during tensile loading and changed to a tensile component at the force free strain (A$$_{rm ff}$$), where the internal uniaxial stress becomes zero in the YBCO layer. The A$$_{rm ff}$$ was evaluated to be 0.19-0.21% at 77 K. The critical current measurements were carried out under a uniaxial tensile load at 77 K. The strain dependence revealed a characteristic behavior, where a maximum was observed at 0.035%. Thus it was made clear that the strain at the critical current maximum does not correlate with A$$_{rm ff}$$ for YBCO coated conductors.

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パーセンタイル:28.8

分野:Physics, Applied

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