I-V characteristics and formation of single Josephson junction using the intrinsic layer in Bi-2223 thin films

Kentaro Setsune; Akihiro Odagawa; Masahiro Sakai; Hideaki Adachi

doi:10.1117/12.332439

9 December 1998 I-V characteristics and formation of single Josephson junction using the intrinsic layer in Bi-2223 thin films

Kentaro Setsune, Akihiro Odagawa, Masahiro Sakai, Hideaki Adachi

Author Affiliations +

Proceedings Volume 3480, Superconducting Superlattices II: Native and Artificial; (1998) https://doi.org/10.1117/12.332439
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Intrinsic Josephson junctions prepared in bulk materials were fabricate in thin films. We selected Bi-2223 instead of often sued Bi-2212 as the superconducting materials in which insulating and superconducting layers are stacked along c- axis. Single crystal fragments having its high crystallinity and flat surfaces were chose carefully among many grains in thin films and Mesa structures were formed by photolithographic technique. Superconducting gap structure and branching structure peculiar to stacked S-I-S junctions were clearly observed on current-voltage characteristics. On the structure stacked by plural intrinsic junctions, the interaction between different intrinsic junctions clearly appeared in decrease of values of Josephson critical current with increasing the number of junctions in the resistive state, and collective switching was observed. The Ic decrease leading to the collective behavior was explained by taking it effective heat diffusion into account. With reducing the number of the junctions, the gap value, which is suppressed by heat generation, increased. This response of the quasi-particle current was evaluated using a single intrinsic junction and confirmed to be able to explained by assuming d-symmetry for the superconducting order parameter without the term of the gap suppression.

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Kentaro Setsune, Akihiro Odagawa, Masahiro Sakai, and Hideaki Adachi "I-V characteristics and formation of single Josephson junction using the intrinsic layer in Bi-2223 thin films", Proc. SPIE 3480, Superconducting Superlattices II: Native and Artificial, (9 December 1998); https://doi.org/10.1117/12.332439

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