Enhancement of Flux-Pinning in Epitaxial Sm1+xBa2-xCu3Oy Films by Introduction of Low-Tc Nanoparticles
Enhancement of Flux-Pinning in Epitaxial Sm1+xBa2-xCu3Oy Films by Introduction of Low-Tc Nanoparticles
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通过引入低 Tc 纳米颗粒增强外延 Sm1 xBa2-xCu3Oy 薄膜中的通量钉扎
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发表时间：
2005
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通讯作者：
M. Mukaida
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作者：
M. Miura;Y. Yoshida;Y. Ichino;Y. Takai;K. Matsumoto;A. Ichinose;S. Horii;M. Mukaida
低温生长（LTG）技术制备的Sm1+xBa2-xCu3Oy （SmBCO）薄膜的临界电流密度（Jc）高达0.28 MA/cm2 （77 K, B∥c， B=5 T）。但在5 T以上，Jc低于NbTi线（4.2 K）。本研究将低临界温度（low- tc）的纳米粒子超导体引入LTG-SmBCO“LTG-SmBCO +纳米粒子”薄膜中，以提高高磁场下的Jc，获得了极高的Jc， 0.1 MA/cm2 （77 K, B∥c， B=8 T）。能量色散x射线光谱（EDX）表明，“LTG-SmBCO +纳米颗粒”薄膜具有纳米级的低tc相和分散在高tc基体中的低tc网络。我们得出结论，“LTG-SmBCO +纳米颗粒”薄膜可以通过引入钉钉中心和改善不可逆性场（Birr）来增强Jc。
Sm1+xBa2-xCu3Oy (SmBCO) films prepared by the low-temperature growth (LTG) technique showed a critical current density (Jc) as high as 0.28 MA/cm2 (77 K, B∥c, B=5 T). However, Jc was lower than that of NbTi wire (4.2 K) above 5 T. In this study, we introduced nanoparticle superconductors with a low critical temperature (low-Tc) into LTG-SmBCO “LTG-SmBCO + nanoparticle” films to improve Jc under the high magnetic field, and obtained an extremely high Jc, 0.1 MA/cm2 (77 K, B∥c, B=8 T). Energy-dispersive X-ray spectroscopy (EDX) showed that the “LTG-SmBCO + nanoparticle” films had a nanosize low-Tc phase and a low-Tc network dispersed in the high-Tc matrix. We concluded that the “LTG-SmBCO + nanoparticle” films could have enhanced Jc by the introduction of pinning centers and the improvement of irreversibility field (Birr).