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arXiv 1707.09679cond-mat.supr-con
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超导NbTiN薄膜中的电荷Berezinskiii-Kosterlitz-无相变

Charge Berezinskii-Kosterlitz-Thouless transition in superconducting NbTiN films

Alexey Yu. Mironov, Daniel M. Silevitch, Thomas Proslier, SvetlanaV. Postolova, Maria V. Burdastyh, Anton K. Gutakovskii, Thomas F. Rosenbaum, Valerii M. Vinoku… 展开作者

Alexey Yu. Mironov, Daniel M. Silevitch, Thomas Proslier, SvetlanaV. Postolova, Maria V. Burdastyh, Anton K. Gutakovskii, Thomas F. Rosenbaum, Valerii M. Vinokur, Tatyana I. Baturina

摘要:

在超导体-绝缘体转变(SIT)发现半个世纪后,该理论的基本预测之一,预计发生在SIT绝缘侧的电荷Berezinskiiii-Kosterlitz-无电荷(BKT)转变仍然没有观察到。电荷BKT转变是涡旋BKT转变的对偶现象,涡旋BKT转变是二维超导性作为在有限温度下出现的零电阻状态存在的核心。对偶图指出了在有限温度下存在具有零电导的超绝缘态的可能性。在这里,我们报告的观察电荷BKT过渡的绝缘侧的SIT,确定的临界行为的电阻。我们发现电荷BKT转变的临界温度依赖于磁场,它首先表现出快速增长,然后在远小于上临界场的磁场下通过最大值。最后,我们确定了有限的静电屏蔽的长度和它的发散在磁场调谐的方法的超导体-绝缘体转变的影响。

英文摘要:

A half-century after the discovery of the superconductor-insulator transition (SIT), one of the fundamental predictions of the theory, the charge Berezinskii-Kosterlitz-Thouless (BKT) transition that is expected to occur at the insulating side of the SIT, has remained unobserved. The charge BKT transition is a phenomenon dual to the vortex BKT transition, which is at the heart of the very existence of two-dimensional superconductivity as a zero-resistance state appearing at finite temperatures. The dual picture points to the possibility of the existence of a superinsulating state endowed with zero conductance at finite temperature. Here, we report the observation of the charge BKT transition on the insulating side of the SIT, identified by the critical behavior of the resistance. We find that the critical temperature of the charge BKT transition depends on the magnetic field exhibiting first the fast growth and then passing through the maximum at fields much less than the upper critical field. Finally, we ascertain the effects of the finite electrostatic screening length and its divergence at the magnetic field-tuned approach to the superconductor-insulator transition.

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