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Two-dimensional Coulomb Glass as a Model for Vortex Pinning in Superconducting Films
JETP Letters ( IF 1.4 ) Pub Date : 2020-08-26 , DOI: 10.1134/s002136402016002x
I. Poboiko , M. V. Feigel’man

A glass model of vortex pinning in highly disordered thin superconducting films in magnetic fields BHc2 at low temperatures is proposed. Strong collective pinning of a vortex system realized in disordered superconductors that are close to the quantum phase transition to the insulating phase — such as InOx, NbN, TiN, MoGe, nano-granular aluminium, and others — is considered theoretically for the first time. Utilizing the replica trick developed for the spin glass theory, we demonstrate that such vortex system is in non-ergodic state of glass type with large kinetic inductance per square LK. Distribution function of local pinning energies is calculated, and it is shown that it possesses a wide gap, i.e. the probability to find a weakly pinned vortex is extremely low.



中文翻译:

二维库仑玻璃作为超导薄膜涡旋固定的模型

涡流在磁场高度无序薄的超导膜的钉扎的玻璃化模型« ħ Ç 2在低温下提出。理论上首次考虑了在无序超导体中实现的涡旋系统的强力集体钉扎,这些无序超导体接近于量子相过渡到绝缘相的过程,例如InO x,NbN,TiN,MoGe,纳米颗粒铝等。 。利用为自旋玻璃理论开发的复制技巧,我们证明了这种涡旋系统处于玻璃态的非遍历状态,每平方公尺L K具有大的动感。。计算了局部钉扎能量的分布函数,结果表明它具有较大的间隙,即发现弱钉扎涡旋的可能性极低。

更新日期:2020-08-26
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