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首页> 外文期刊>Physical Review, B. Condensed Matter >MAGNETO-OPTICAL STUDY OF FLUX PENETRATION AND CRITICAL CURRENT DENSITIES IN [001] TILT YBA2CU3O7-DELTA THIN-FILM BICRYSTALS
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MAGNETO-OPTICAL STUDY OF FLUX PENETRATION AND CRITICAL CURRENT DENSITIES IN [001] TILT YBA2CU3O7-DELTA THIN-FILM BICRYSTALS

机译：[001]倾斜的YBA2CU3O7-Δ薄膜薄膜比塞尔的磁通量和临界电流密度的磁光研究

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Magneto-optical (MO) imaging has been used to visualize and calculate magnetic flux and current distributions at temperatures T ranging from 7 to 80 K in thin-film [001] tilt YBa2Cu3O7-delta bicrystals with misorientationtation 3 degrees less than or equal to theta less than or equal to 10 degrees. A characteristic cusp in the flux distribution B-z(x,y) was observed for 5 degrees less than or equal to theta less than or equal to 7 degrees, which is shown to indicate that the critical current density J(b) across the boundary is smaller than the intragrain J(c). We use the Bean model for thin-film superconductors to calculate the observed features of the B,(x,y) distribution and to separate both the intragrain J, and intergrain J(b)(theta) independently from the MO data. The study of angular and temperature dependencies of J(b)(T, theta) in bicrystals with different theta shows that J(b)(B) strongly decreases with theta above theta approximate to 5 degrees. The decrease of J(b)(T, theta) with temperature becomes weaker as the misorientation angle theta is increased, so the substantial difference:in J(b) for 5 degrees and 7 degrees boundaries at low T turns out to be less pronounced at liquid-nitrogen temperatures. In addition, the ratio J(b)(theta, T)/J(c)(T) for low-angle grain boundaries is shown to exhibit an anomalous increase with T, thus indicating that the grain boundaries can provide additional flux pinning. This is plausibly associated with the grain boundary dislocations that accommodate the misorientation of the grains. [References: 76]
机译：磁光（MO）成像已用于可视化并计算温度T范围为7到80 K的薄膜[001]倾斜YBa2Cu3O7-δ双晶体中的取向差小于或等于3度的磁通量和电流分布。小于或等于10度。在小于或等于theta小于或等于7度的5度处观察到磁通量分布Bz（x，y）的特征尖点，这表明跨边界的临界电流密度J（b）为小于晶粒内J（c）。我们将Bean模型用于薄膜超导体，以计算B，（x，y）分布的观测特征，并从MO数据中独立地分离出晶粒内J和晶粒间J（b）（theta）。对具有不同θ的双晶体中J（b）（T，theta）的角度和温度依赖性的研究表明，当θ高于θ约5度时，J（b）（B）急剧减小。 J（b）（T，theta）随温度的降低随着取向差角theta的增加而变弱，因此存在实质性差异：在J（b）中，低T下5度和7度的边界变小了在液氮温度下。另外，对于低角度晶界的比率J（b）（θ，T）/ J（c）（T）显示出随着T异常增加，因此表明晶界可以提供附加的通量钉扎。这可能与晶界错位有关，后者适应了晶粒的错位。 [参考：76]

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