液相外延生长取向差角为45 °的YBCO双晶薄膜的电输运性质
Electric transport properties of YBCO bicrystal films with 45o misorientation angle grown by liquid phase epitaxy
摘要：
本文报道了用液相外延（LPE）技术在MgO非对称双晶衬底上生长的YBa_2Cu_3 O_（7-x）薄膜的晶界输运性质。总共研究了大约10个样品。在5 K的临界电流密度的零场值的大量分散已被观察到。在我们的研究中发现的104 A/cm ~ 2数量级的Jc的上限接近于以前报道的各种物理气相沉积方法生长的45 o双晶的数据，而LPE生长的双晶的Jc的最小值与以前发表的结果有显著差异，恰好等于零。对于Jc非零的样本，我们发现了几种不同类型的临界电流对磁场的依赖性，范围从类似夫琅禾弗的模式到零场时具有最小值的Ic（H）曲线。
英文摘要：
We report on transport properties of grain boundaries fabricated in YBa2Cu3O7-x thin films grown by the liquid phase epitaxy (LPE) technique on MgO asymmetrical bicrystal substrate with 45o misorientation angle. In total around 10 samples have been studied. Substantial scatter of zero field values of the critical current density at 5K has been observed. The upper limit of Jc of the order of 104 A/cm2 found in our study is close to previously reported data for 45o bicrystals grown by various physical vapour deposition methods while the minimal value of Jc for the LPE grown bicrystals in striking difference to the results published before is exactly equal to zero. For samples with non-zero Jc we have found a few different types of critical current dependence on magnetic field ranging from pattern reminiscent Fraunhover-like Ic(H) to Ic(H) profile with Ic minimum at zero field.
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