Direct numerical experiments on electromagnetic wave emission by flux flow in layered high-Tc superconductors

Masahiko Machida; Tomio Koyama; Masashi Tachiki

doi:10.1117/12.332453

9 December 1998 Direct numerical experiments on electromagnetic wave emission by flux flow in layered high-T_csuperconductors

Masahiko Machida, Tomio Koyama, Masashi Tachiki

Author Affiliations +

Proceedings Volume 3480, Superconducting Superlattices II: Native and Artificial; (1998) https://doi.org/10.1117/12.332453
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

We derive a classical equation of motion on the superconducting phase in Josephson coupled layered High-Tc superconductors from the effective action obtained by using the path-integral method for the BCS microscopic theory considering the Josephson coupling between neighboring superconducting layers. The equation can describe the dynamics of the superconducting phase in the presence of the ab-plane parallel magnetic field. We perform numerical simulations on the equation, and study the dynamics of the superconducting phase under the collective motions of the Josephson vortices. In the simulations, we employ the open boundary condition in the 2D rectangular computational region, and measure the local electric field at the edge from interests about the emission of the electromagnetic wave by the flux flow. It is found that in the low field region, chaotic dynamics of the electric field is observed by reflecting non-regular motions of weakly correlated vortices. On the other hand, in the high field region, regular oscillations of the electric field can be detected as long as the stability of the driven vortex lattice is maintained, while further increasing the transport current results in instabilities of the driven vortex lattice and chaotic oscillations of the electric field appear.

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Masahiko Machida, Tomio Koyama, and Masashi Tachiki "Direct numerical experiments on electromagnetic wave emission by flux flow in layered high-T_csuperconductors", Proc. SPIE 3480, Superconducting Superlattices II: Native and Artificial, (9 December 1998); https://doi.org/10.1117/12.332453

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