首页> 外文期刊>Japanese Journal of Applied Physics. Part 2, Letters & Express Letters >Enhancement of Flux-Pinning in Epitaxial Sm_(1+x)Ba_(2-x)Cu_3O_y Films by Introduction of Low-T_c Nanoparticles
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Enhancement of Flux-Pinning in Epitaxial Sm_(1+x)Ba_(2-x)Cu_3O_y Films by Introduction of Low-T_c Nanoparticles

机译:通过引入低T_c纳米粒子增强外延Sm_(1 + x)Ba_(2-x)Cu_3O_y薄膜的助焊固定

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摘要

Sm_(1+x)Ba_(2-x)Cu_3O_y (SmBCO) films prepared by the low-temperature growth (LTG) technique showed a critical current density (J_c) as high as 0.28 MA/cm~2 (77 K, B ∥ c, B = 5 T). However, J_c was lower than that of NbTi wire (4.2 K) above 5T. In this study, we introduced nanoparticle superconductors with a low critical temperature (low-T_c) into LTG-SmBCO "LTG-SmBCO + nanoparticle" films to improve J_c under the high magnetic field, and obtained an extremely high J_c, 0.1 MA/cm~2 (77K, B ∥ c, B = 8T). Energy-dispersive X-ray spectroscopy (EDX) showed that the "LTG-SmBCO + nanoparticle" films had a nanosize low-T_c phase and a low-T_c network dispersed in the high-T_c matrix. We concluded that the "LTG-SmBCO + nanoparticle" films could have enhanced J_c by the introduction of pinning centers and the improvement of irreversibility field (B_(irr)).
机译:通过低温生长(LTG)技术制备的Sm_(1 + x)Ba_(2-x)Cu_3O_y(SmBCO)膜显示的临界电流密度(J_c)高达0.28 MA / cm〜2(77 K,B ∥c,B = 5 T)。但是,在5T以上,J_c低于NbTi焊丝(4.2 K)。在这项研究中,我们将具有低临界温度(low-T_c)的纳米超导体引入LTG-SmBCO“ LTG-SmBCO +纳米颗粒”薄膜中,以改善强磁场下的J_c,并获得了极高的J_c,0.1 MA / cm 〜2(77K,B∥c,B = 8T)。能量色散X射线光谱法(EDX)表明,“ LTG-SmBCO +纳米颗粒”薄膜具有纳米尺寸的低T_c相和分散在高T_c基体中的低T_c网络。我们得出的结论是,“ LTG-SmBCO +纳米颗粒”薄膜可以通过引入钉扎中心和改善不可逆场(B_(irr))来增强J_c。

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