High-speed flux flow of Josephson vortices in HTS single crystals

Tsutomu Yamashita; Kensuke Nakajima; T. Tachiki

doi:10.1117/12.397834

6 September 2000 High-speed flux flow of Josephson vortices in HTS single crystals

Tsutomu Yamashita; Kensuke Nakajima; T. Tachiki

Author Affiliations +

Proceedings Volume 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV; (2000) https://doi.org/10.1117/12.397834
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

We have estimated velocities of vortices introduced between the superconducting layers of high-temperature superconductors under a driving current flowing along the c-axis. The measured vortex velocity is approximately 4 m/s in the micro-bridges with typical sizes of 60 micrometer long and 40 X 50 micrometer² area fabricated from La_2-xSr_xCuO₄ (LSCO) single crystals by the electro-discharge machining (EDM) technique. In the framework of flux creep model can explain that the creep occurs in the bridges with large size causing a low bias current density. On the other hand, we observed a sharp up-turn in flux-flow branches on current-voltage characteristics of the micro-bridges fabricated by the FIB technique, which are smaller than the bridges fabricated by the EDM. This indicates that the motion of Josephson vortices in LSCO matches the propagation of an electromagnetic wave with one of the modes, which corresponds to the mode velocity of 1.6 X 10⁵ m/s, in the multi-layered structure. The high-speed flux- flow of Josephson vortices can be utilized for high-speed switching gates or electromagnetic wave oscillators in millimeter and sub- millimeter wave bands.

Citation Download Citation

Tsutomu Yamashita, Tsutomu Yamashita, Kensuke Nakajima, Kensuke Nakajima, T. Tachiki, T. Tachiki, } "High-speed flux flow of Josephson vortices in HTS single crystals", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397834; https://doi.org/10.1117/12.397834

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