Grain boundary Josephson effects in Y-Ba-Cu-O thick film prepared by spray pyrolysis technique

Walia, D K; Gupta, Anurag

doi:10.1088/0953-2048/4/11/026

Cited by 9 publications

(1 citation statement)

References 10 publications

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“…It could vary from S-N-S to S-N-I-S to S-I-S, as the J c of the microbridges is gradually decreased. This is in agreement with our earlier results on YBCO microbridges [13].…”

Section: Introductionsupporting

confidence: 94%

Grain boundary Josephson studies in BiSrCaCuO microbridges

Kaur¹,

Gupta²

2002

J. Phys. D: Appl. Phys.

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High-quality superconducting thin films of Bi2Sr2CaCu2OY have successfully been deposited on MgO (100) substrate using spray pyrolysis technique. Microbridge structures of various dimensions were patterned on the superconducting films using various techniques. A systematic study of the temperature dependence of the critical current (Ic) of the microbridges was carried out to understand the nature of the grain boundary Josephson weak links. These studies showed that the nature of the grain boundary weak links could vary from superconductor-normal metal-superconductor to superconductor-normal metal-insulator-superconductor to superconductor-insulator-superconductor, as the Jc of the microbridges is gradually decreased. The irradiation of microwaves on these microbridges led to the appearance of well-defined Shapiro steps in the I-V characteristics.

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“…It could vary from S-N-S to S-N-I-S to S-I-S, as the J c of the microbridges is gradually decreased. This is in agreement with our earlier results on YBCO microbridges [13].…”

Section: Introductionsupporting

confidence: 94%

Grain boundary Josephson studies in BiSrCaCuO microbridges

Kaur¹,

Gupta²

2002

J. Phys. D: Appl. Phys.

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Approximate analytic equations for small shapiro step Josephson junctions

Yamaguchi

Kawaji

Suzuki

et al. 1995

Electron Comm Jpn Pt II

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Observation of Shapiro step is important for evaluation of the Josephson junction. This theoretical characteristic is given by a nonlinear differential equation with the normalized frequency ω based on the current driven resistively shunted junction (RSJ) model as a parameter [14]. Although this model provides good agreement with the experimental results, the number of operations for the numerical solution of the equation is excessive. Hence, discussions of the experimental results by means of theoretical values are difficult. As a result, a proposal of a simple approximate equation which can describe the theoretical characteristics only with ω is considered extremely useful. In the high temperature superconducting junction extensively studied recently, the IcRn product is large and ω < 0.1 is expected. For ω < 0.1, the current amplitude of Shapiro step decreases excessively. In practice, Shapiro steps are often not observed at a high‐temperature superconducting junction. This is considered to be caused by the ω < 0.1 measurement condition. It is important for evaluation of the junction to investigate this problem. No detailed analysis has been carried out for the region with ω < 0.1. On the other hand, since ω < 0.1 is the ideal operating condition of the Josephson mixer, understanding of the characteristics is important from the application point of view. In this paper, understanding of the theoretical characteristics for ω < 0.1, the derivation of the approximate equation and the condition in which Shapiro step cannot be observed are investigated. The analysis results and the experimental values are compared, and the effectiveness of the analysis is presented.

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