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首页> 外文会议>International cryogenic materials conference >Magneto - optical observation of magnetic flux penetration and current distribution in Y-Ba-Cu-O single crystals and melt-textured creamics
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Magneto - optical observation of magnetic flux penetration and current distribution in Y-Ba-Cu-O single crystals and melt-textured creamics

机译：磁通磁通渗透和电流分布在Y-Ba-Cu-O单晶和熔体纹理奶油中的电流观察

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摘要

The local critical current properties in YBaCuO ceramics, melt-textured on the 211 substrate, were estimated by analyzing the results of magneto-optical imagings. The local critical current density J_c were determined and the pinning mechanisms were argued from measurements of the J_c vs the temperature and 211 additions. The combined experiments show that the magnitude of J_c in single crystals and ceramics is largely determined by the intragrain flux pinning. Experimental values of J_c varied from 2 10~4 up to (5/8) 10~5 A cm~(-2) for the regions of sample with the different structures. It is shown that areas of sample which initially were 123-compact have the limitations for J_c approx 2 10~4 A cm~(-2), which are common for material manufactured by every kind of melt-processing technique and is determined by the distribution of current-limiting defects. Thus the current has to percolate through the defects network. But the area of the sample, which initially was substrate 211, is highly textured isotropic YBaCuO ceramics capable of carrying current density up to 10~6 A cm~(-2). The pinning mechanism is determined by 211 particles as the dominant pinning centers in the 5/77 K temperature region. The J_c can be tailored through variations in size, shape and amount of 211 inclusions: much finer normal particles should be introduced in order to improve the critical current density.
机译：通过分析磁光影片的结果，估计了在211衬底上熔化纹理的Ybacuo陶瓷中的局部临界电流特性。确定局部临界电流密度J_C，并从J_C的测量结果中指出钉扎机制VS温度和211个添加。合并的实验表明，单晶硅和陶瓷中的J_C的大小主要由腔内磁通钉钉确定。 J_C的实验值从2 10〜4的不同结构变化为20〜4〜5a cm〜（-2），用于不同的结构的样品区域。结果表明，最初为123块的样品区域具有J_C大约2 10〜4a cm〜（-2）的限制，这对于通过各种熔体处理技术制造的材料常见并且由此确定限流缺陷的分布。因此，电流必须通过缺陷网络渗透。但是，最初是衬底211的样品的区域是高度纹理的各向同性YBacuo陶瓷，其能够载流量高达10〜6a cm〜（-2）。钉扎机构由211个颗粒作为5/77K温度区域中的主导钉扎中心确定。 J_C可以通过尺寸的变化，形状和211个夹杂物的变化来定制：应引入更细的正常颗粒以提高临界电流密度。

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