The resistivity as a function of temperature of GdBa₂Cu_3-xAg_xO_7-δ superconductors reveals that the critical temperature, T_c, increases with the concentration of Ag (x). An equation has been suggested to understand the behaviour of T_c (x). The coherence length has been extracted on the basis of the three dimensional Aslamazov-Larkin (3DAL) equation to understand the enhancement in the critical temperature. We have studied current-voltage (IV) curves below T_c to understand the nonlinearity observed in doped samples. An exponent has been extracted to explore the possibility of Kosterlitz-Thouless (KT) transition and the role of the coherence length in the nonlinear behaviour.

中文翻译：

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Ag掺杂GBCO的相干长度和非线性电流电压（IV）特性增强

的电阻率作为导盲犬协会的温度的函数的₂铜_{3- X}银_X ö _7-δ超导揭示了临界温度，Ť _Ç，有Ag（的浓度增加X）。已经提出了一个方程来理解T _c（x）的行为。相干长度是根据三维Aslamazov-Larkin（3DAL）方程提取的，以了解临界温度的提高。我们研究了低于T _c的电流-电压（IV）曲线了解掺杂样品中观察到的非线性。提取了一个指数以探索Kosterlitz-Thouless（KT）跃迁的可能性以及相干长度在非线性行为中的作用。