Josephson coupling in a-axis YBa2Cu3O 7-δ/Pr1-xYxBa2Cu 3O7-δ /YBa2Cu3O 7-δ sandwich-type junctions

T. Umezawa; D. J. Lew; S. K. Streiffer; M. R. Beasley

doi:10.1063/1.110204

Josephson coupling in a-axis YBa₂Cu₃O _7-δ/Pr_1-xY_xBa₂Cu ₃O_7-δ /YBa₂Cu₃O _7-δ sandwich-type junctions

T. Umezawa, D. J. Lew, S. K. Streiffer, M. R. Beasley

Research output: Contribution to journal › Article › peer-review

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Abstract

We have studied Josephson coupling in a-axis YBa₂Cu ₃O_7-δ/Pr_1-xY_xBa ₂Cu₃O_7-δ /YBa₂Cu ₃O_7-δ sandwich-type superconductor/normal/ superconductor (SNS) junctions. Growth parameters for the films were optimized for smoothness of the barrier interfaces and the films were well characterized by scanning electron microscopy, atomic force microscopy, and cross-sectional transmission electron microscopy. Transport of the barrier material was highly dependent upon the doping: for x=0, the resistivity followed a T^-1/4 behavior and was ∼10⁵ Ω cm at 4.2 K; for x=0.45, the resistivity was nearly metallic and was 10^-1 Ω cm at 4.2 K. In the small junction regime W<λ_j, the critical current scaled with junction area, and was modulated by a magnetic field. We have compared our results to other SNS work and found that the coupling strength of the barrier increases with the conductivity of the barrier material. Possible sources of the coupling are discussed.

Original language	English
Pages (from-to)	3221-3223
Number of pages	3
Journal	Applied Physics Letters
Volume	63
Issue number	23
DOIs	https://doi.org/10.1063/1.110204
State	Published - 1993
Externally published	Yes

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title = "Josephson coupling in a-axis YBa2Cu3O 7-δ/Pr1-xYxBa2Cu 3O7-δ /YBa2Cu3O 7-δ sandwich-type junctions",

abstract = "We have studied Josephson coupling in a-axis YBa2Cu 3O7-δ/Pr1-xYxBa 2Cu3O7-δ /YBa2Cu 3O7-δ sandwich-type superconductor/normal/ superconductor (SNS) junctions. Growth parameters for the films were optimized for smoothness of the barrier interfaces and the films were well characterized by scanning electron microscopy, atomic force microscopy, and cross-sectional transmission electron microscopy. Transport of the barrier material was highly dependent upon the doping: for x=0, the resistivity followed a T-1/4 behavior and was ∼105 Ω cm at 4.2 K; for x=0.45, the resistivity was nearly metallic and was 10-1 Ω cm at 4.2 K. In the small junction regime W<λj, the critical current scaled with junction area, and was modulated by a magnetic field. We have compared our results to other SNS work and found that the coupling strength of the barrier increases with the conductivity of the barrier material. Possible sources of the coupling are discussed.",

author = "T. Umezawa and Lew, {D. J.} and Streiffer, {S. K.} and Beasley, {M. R.}",

year = "1993",

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AU - Umezawa, T.

AU - Lew, D. J.

AU - Streiffer, S. K.

AU - Beasley, M. R.

PY - 1993

Y1 - 1993

N2 - We have studied Josephson coupling in a-axis YBa2Cu 3O7-δ/Pr1-xYxBa 2Cu3O7-δ /YBa2Cu 3O7-δ sandwich-type superconductor/normal/ superconductor (SNS) junctions. Growth parameters for the films were optimized for smoothness of the barrier interfaces and the films were well characterized by scanning electron microscopy, atomic force microscopy, and cross-sectional transmission electron microscopy. Transport of the barrier material was highly dependent upon the doping: for x=0, the resistivity followed a T-1/4 behavior and was ∼105 Ω cm at 4.2 K; for x=0.45, the resistivity was nearly metallic and was 10-1 Ω cm at 4.2 K. In the small junction regime W<λj, the critical current scaled with junction area, and was modulated by a magnetic field. We have compared our results to other SNS work and found that the coupling strength of the barrier increases with the conductivity of the barrier material. Possible sources of the coupling are discussed.

AB - We have studied Josephson coupling in a-axis YBa2Cu 3O7-δ/Pr1-xYxBa 2Cu3O7-δ /YBa2Cu 3O7-δ sandwich-type superconductor/normal/ superconductor (SNS) junctions. Growth parameters for the films were optimized for smoothness of the barrier interfaces and the films were well characterized by scanning electron microscopy, atomic force microscopy, and cross-sectional transmission electron microscopy. Transport of the barrier material was highly dependent upon the doping: for x=0, the resistivity followed a T-1/4 behavior and was ∼105 Ω cm at 4.2 K; for x=0.45, the resistivity was nearly metallic and was 10-1 Ω cm at 4.2 K. In the small junction regime W<λj, the critical current scaled with junction area, and was modulated by a magnetic field. We have compared our results to other SNS work and found that the coupling strength of the barrier increases with the conductivity of the barrier material. Possible sources of the coupling are discussed.

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Josephson coupling in a-axis YBa₂Cu₃O _7-δ/Pr_1-xY_xBa₂Cu ₃O_7-δ /YBa₂Cu₃O _7-δ sandwich-type junctions

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