Superconducting interlayer coupling of NbN/X (X Ag, CNx) multilayered films

M. Nakanishi; Y. Tsuchiya; N. Nakayama; K. Yoshimura; K. Kosuge; S. Nagata; S. Yamaguchi

doi:10.1016/0921-4534(95)00500-5

Superconducting interlayer coupling of NbN/X (X Ag, CN_x) multilayered films

M. Nakanishi, Y. Tsuchiya, N. Nakayama, K. Yoshimura, K. Kosuge, S. Nagata, S. Yamaguchi

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

2 Citations (Scopus)

Abstract

The interlayer coupling of superconducting NbN thin films through metallic Ag and insulating CN_x thin films has been investigated from resistivity measurements of [NbN(170 A ̊)/X(t A ̊)]₁₀ (X Ag, CN_x) multilayered films. When Ag layer thicknesses are thicker than 150 Åm NbN layers are decoupled and the transition temperatures are nearly equal 8.2 K. The transition transition temperature increases with decreasing Ag layer thickness, obeying Werthamer's theory for the proximity effect. On the other hand, with the increase of CN_x layer thickness, the transition temperature is lowered steeply and almost linearly, indicating a coupling mechanism other than the proximity effect.

Original language	English
Pages (from-to)	33-38
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	253
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(95)00500-5
Publication status	Published - Oct 20 1995
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(95)00500-5

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title = "Superconducting interlayer coupling of NbN/X (X Ag, CNx) multilayered films",

abstract = "The interlayer coupling of superconducting NbN thin films through metallic Ag and insulating CNx thin films has been investigated from resistivity measurements of [NbN(170 A ̊)/X(t A ̊)]10 (X Ag, CNx) multilayered films. When Ag layer thicknesses are thicker than 150 {\AA}m NbN layers are decoupled and the transition temperatures are nearly equal 8.2 K. The transition transition temperature increases with decreasing Ag layer thickness, obeying Werthamer's theory for the proximity effect. On the other hand, with the increase of CNx layer thickness, the transition temperature is lowered steeply and almost linearly, indicating a coupling mechanism other than the proximity effect.",

author = "M. Nakanishi and Y. Tsuchiya and N. Nakayama and K. Yoshimura and K. Kosuge and S. Nagata and S. Yamaguchi",

year = "1995",

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doi = "10.1016/0921-4534(95)00500-5",

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T1 - Superconducting interlayer coupling of NbN/X (X Ag, CNx) multilayered films

AU - Nakanishi, M.

AU - Tsuchiya, Y.

AU - Nakayama, N.

AU - Yoshimura, K.

AU - Kosuge, K.

AU - Nagata, S.

AU - Yamaguchi, S.

PY - 1995/10/20

Y1 - 1995/10/20

N2 - The interlayer coupling of superconducting NbN thin films through metallic Ag and insulating CNx thin films has been investigated from resistivity measurements of [NbN(170 A ̊)/X(t A ̊)]10 (X Ag, CNx) multilayered films. When Ag layer thicknesses are thicker than 150 Åm NbN layers are decoupled and the transition temperatures are nearly equal 8.2 K. The transition transition temperature increases with decreasing Ag layer thickness, obeying Werthamer's theory for the proximity effect. On the other hand, with the increase of CNx layer thickness, the transition temperature is lowered steeply and almost linearly, indicating a coupling mechanism other than the proximity effect.

AB - The interlayer coupling of superconducting NbN thin films through metallic Ag and insulating CNx thin films has been investigated from resistivity measurements of [NbN(170 A ̊)/X(t A ̊)]10 (X Ag, CNx) multilayered films. When Ag layer thicknesses are thicker than 150 Åm NbN layers are decoupled and the transition temperatures are nearly equal 8.2 K. The transition transition temperature increases with decreasing Ag layer thickness, obeying Werthamer's theory for the proximity effect. On the other hand, with the increase of CNx layer thickness, the transition temperature is lowered steeply and almost linearly, indicating a coupling mechanism other than the proximity effect.

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