Imaging of super-fast dynamics and flow instabilities of superconducting vortices

被引：175

作者：

Embon, L. ^{[1
]}

Anahory, Y. ^{[1
,2
]}

Jelic, Z. L. ^{[3
,4
]}

Lachman, E. O. ^{[1
]}

Myasoedov, Y. ^{[1
]}

Huber, M. E. ^{[5
,6
]}

Mikitik, G. P. ^{[7
]}

Silhanek, A. V. ^{[4
]}

Milosevic, M. V. ^{[3
]}

Gurevich, A. ^{[8
]}

Zeldov, E. ^{[1
]}

机构：

[1] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-7610001 Rehovot, Israel

[2] Hebrew Univ Jerusalem, Racah Inst Phys, IL-9190401 Jerusalem, Israel

[3] Univ Antwerp, Dept Fys, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

[4] Univ Liege, Dept Phys, B-4000 Sart Tilman Par Liege, Belgium

[5] Univ Colorado Denver, Dept Phys, Denver, CO 80217 USA

[6] Univ Colorado Denver, Dept Elect Engn, Denver, CO 80217 USA

[7] Ukrainian Acad Sci, Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine

[8] Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

基金：

以色列科学基金会; 美国能源部;

关键词：

ELECTRONIC INSTABILITY; PINNING LANDSCAPE; SURFACE BARRIERS; VORTEX; INFORMATION; JOSEPHSON; MOTION; PHASE;

D O I：

10.1038/s41467-017-00089-3

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Quantized magnetic vortices driven by electric current determine key electromagnetic properties of superconductors. While the dynamic behavior of slow vortices has been thoroughly investigated, the physics of ultrafast vortices under strong currents remains largely unexplored. Here, we use a nanoscale scanning superconducting quantum interference device to image vortices penetrating into a superconducting Pb film at rates of tens of GHz and moving with velocities of up to tens of km/s, which are not only much larger than the speed of sound but also exceed the pair-breaking speed limit of superconducting condensate. These experiments reveal formation of mesoscopic vortex channels which undergo cascades of bifurcations as the current and magnetic field increase. Our numerical simulations predict metamorphosis of fast Abrikosov vortices into mixed Abrikosov-Josephson vortices at even higher velocities. This work offers an insight into the fundamental physics of dynamic vortex states of superconductors at high current densities, crucial for many applications.

引用

页数：10

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