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首页> 外文期刊>Physical review >Structural and T_c inhomogeneities inherent to doping in La_(2-x)Sr_xCuO_4 superconductors and their effects on the precursor diamagnetism
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Structural and T_c inhomogeneities inherent to doping in La_(2-x)Sr_xCuO_4 superconductors and their effects on the precursor diamagnetism

机译：La_（2-x）Sr_xCuO_4超导体掺杂固有的结构和T_c不均匀性及其对前驱体反磁性的影响

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摘要

The inhomogeneities inherent to the random distribution of Sr dopants in La_(2-x)Sr_xCuO_4 superconductors are probed by measuring the x-ray diffraction linewidths and the Meissner transition widths, and then consistently explained on the grounds of a simple model in which the local Sr content is calculated by averaging over distances close to the in-plane electronic mean free path. By taking into account these intrinsic bulk inhomogeneities with long characteristic lengths (much larger than the superconducting coherence length amplitudes), the precursor diamagnetism measured above T_c, a fingerprint of the superconducting transition own nature, is then explained for all doping levels in terms of the conventional Gaussian-Ginzburg-Landau approach for layered superconductors. These results also suggest that the electronic inhomogeneities observed in the normal state by using surface probes overestimate the ones in the bulk.
机译：通过测量x射线衍射线宽和Meissner跃迁宽度来探究La_（2-x）Sr_xCuO_4超导体中Sr掺杂物的随机分布所固有的不均匀性，然后以简单模型为基础进行一致解释，其中局部通过对接近平面内电子平均自由程的距离进行平均来计算Sr含量。通过考虑具有长特征长度（比超导相干长度幅度大得多）的这些固有本体不均匀性，然后解释了在T_c以上测量的前体反磁性，即超导过渡本身性质的指纹，根据分层超导体的传统高斯-金茨堡-兰道方法。这些结果还表明，通过使用表面探针在正常状态下观察到的电子不均匀性高估了整体中的电子不均匀性。

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