Josephson weak link based on proximity effect in long bi-metallic thin-film bridge

Author:

Turutanov O. G.12ORCID,Sivakov A. G.1ORCID,Pokhila A. S.1ORCID,Grajcar M.23ORCID

Affiliation:

1. B.Verkin Institute for Low Temperature Physics and Engineering of NAS of Ukraine 1 , 47 Nauky Ave., 61103 Kharkiv, Ukraine

2. Department of Experimental Physics, Comenius University 2 , Mlynská dolina, 84248 Bratislava, Slovakia

3. Institute of Physics, Slovak Academy of Sciences 3 , Dúbravská cesta, Bratislava, Slovakia

Abstract

We prepared a bi-metal Sn/Al thin film bridge of 1 × 5 µm2 in size and exposed it to microwave irradiation in a frequency range of 7 to 40 GHz to explore the Shapiro steps in the current-voltage characteristics, which served as a reliable indicator for assessing current-phase relation (CPR). The measurements were made in the temperature range (0.89 … 0.99)Tc with Tc = 3.66 K. No fractional steps are observed at 10 GHz, while all integer steps are present, and their widths oscillate with microwave field amplitude, which suggests a non-skewed quasi-sine CPR. Therefore, the normal-metal covering alters the resistive state of the long thin-film strip containing phase-slip centers so that the bi-metallic long bridge exhibits characteristics similar to a Josephson weak link. Considering a simple fabrication procedure, it may be utilized in making Josephson-effect-based devices such as DC and RF SQUIDs, especially in low-budget projects. Additional small-scale oscillations of the step widths found between the main peaks and the missing first step at a higher frequency of 20 GHz near Tc may be associated with Landau–Zener transitions between Andreev states and require further detailed study.

Funder

North Atlantic Treaty Organization

Slovak Research and Development Agency

EU NextGenerationEU

Science and Technology Center in Ukraine

Publisher

AIP Publishing

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