Dependence of the critical current on the misorientation angle in high-temperature superconductor (HTS) [001]-tilt bicrystal is theoretically examined. It’s argued that in the case of relatively small values of the bicrystal misorientation angle θ (θ ≤ 10–15°) the critical current as well as the resistive state emergence are determined by depinning of Abrikosov vortices, which are locked by c-oriented edge dislocations which form the low-angle [001]-tilt grain boundary and are aligned in a linear row along it. Dependence of the depinning critical current on the misorientation angle of bicrystal is calculated for this case and it reveals a good agreement with experimental data obtained on HTS bicrystals with low-angle [001]-tilt grain boundaries.

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具有低角度 [001] 倾斜晶界的 HTS 双晶中临界电流的取向角依赖性

从理论上研究了临界电流对高温超导体 (HTS) [001] 倾斜双晶中取向差角的依赖性。有人认为，在双晶取向角 θ 值相对较小的情况下（θ ≤ 10-15°），临界电流和电阻态出现是由 Abrikosov 涡旋的脱钉决定的，而 Abrikosov 涡旋被 c 取向边缘锁定位错形成低角度 [001] 倾斜晶界并沿其排列成线性行。在这种情况下，计算了脱钉临界电流对双晶取向差角的依赖性，它与在具有低角度 [001] 倾斜晶界的 HTS 双晶上获得的实验数据非常吻合。