（TMTSF）2ClO 4中杂质控制到颗粒超导的交叉
Crossover from impurity-controlled to granular superconductivity in (TMTSF)2ClO4
摘要：
使用适当的冷却程序，可控量的非磁性结构无序可以在低温下引入（TMTSF）2ClO 4。在这里，我们进行了同步测量的运输和磁性能的（TMTSF）2ClO 4在其正常和超导状态，同时精细地覆盖三个数量级的冷却速率周围的阴离子有序温度。我们的结果表明，随着无序密度的增加，存在一个交叉之间的均匀缺陷控制的d波超导和颗粒超导。在缓慢的冷却速率下，随着少量的无序，超导性质的演变很好地描述了Abrikosov-Gorkov理论，进一步证实了该化合物中的非s波配对。相比之下，在快速冷却速率，零电阻和抗磁屏蔽是通过嵌入在正常导电背景中的超导熔池的随机分布网络实现的，并通过邻近效应耦合互连。AC复磁化率的温度依赖性揭示了典型的粒状超导体网络的功能。这使得（TMTSF）2ClO 4成为颗粒超导性的模型系统，其中颗粒尺寸和它们的浓度在同一样品内是可调的。
英文摘要：
Using a proper cooling procedure, a controllable amount of non-magnetic structural disorder can be introduced at low temperature in (TMTSF)2ClO4. Here we performed simultaneous measurements of transport and magnetic properties of (TMTSF)2ClO4 in its normal and superconducting states, while finely covering three orders of magnitude of the cooling rate around the anion ordering temperature. Our result reveals, with increasing density of disorder, the existence of a crossover between homogeneous defect-controlled d-wave superconductivity and granular superconductivity. At slow cooling rates, with small amount of disorder, the evolution of superconducting properties is well described with the Abrikosov-Gorkov theory, providing further confirmation of non-s-wave pairing in this compound. In contrast, at fast cooling rates, zero resistance and diamagnetic shielding are achieved through a randomly distributed network of superconducting puddles embedded in an normal conducting background and interconnected by proximity effect coupling. The temperature dependence of the AC complex susceptibility reveals features typical for a network of granular superconductors. This makes (TMTSF)2ClO4 a model system for granular superconductivity where the grain size and their concentration are tunable within the same sample.
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