Josephson plasma in Bi2Sr2CaCu2O8+δ detected by Nb/AlOx/Nb junction

Y. Yamada; Y. Uematsu; Y. Mizugaki; Koji Nakajima; T. Yamashita

doi:10.1016/S0921-4534(01)00679-7

Josephson plasma in Bi2Sr2CaCu2O8+δ detected by Nb/AlOx/Nb junction

Y. Yamada, Y. Uematsu, Y. Mizugaki, Koji Nakajima, T. Yamashita

電気通信研究所

研究成果: Article › 査読

1 被引用数 (Scopus)

抄録

We fabricated Nb/AlO_x/Nb Josephson junctions on Bi₂Sr₂CaCu₂O_8+δ (BSCCO) single crystals to detect the Josephson plasma in BSCCO. A thin gold layer was employed between BSCCO and Nb/AlO_x/Nb to avoid interdiffusion of oxygen in BSCCO. We measured the current-voltage properties of the Nb/AlO_x/Nb junctions in a liquid helium bath, and observed clear periodic step structures. A characteristic frequency corresponding to the voltage spacing of the steps was 63 GHz, which agreed with the Josephson plasma frequency of BSCCO. The result indicates that the Josephson plasma in BSCCO can interact with the ac Josephson current of the closely coupled Nb/AlO_x/Nb Josephson junctions.

本文言語	English
ページ（範囲）	244-246
ページ数	3
ジャーナル	Physica C: Superconductivity and its applications
巻	362
号	1-4
DOI	https://doi.org/10.1016/S0921-4534(01)00679-7
出版ステータス	Published - 2001 9 1

ASJC Scopus subject areas

Condensed Matter Physics

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10.1016/S0921-4534(01)00679-7

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引用スタイル

@article{b0354b0d188741569f2c015f5bd2ed68,

title = "Josephson plasma in Bi2Sr2CaCu2O8+δ detected by Nb/AlOx/Nb junction",

abstract = "We fabricated Nb/AlOx/Nb Josephson junctions on Bi2Sr2CaCu2O8+δ (BSCCO) single crystals to detect the Josephson plasma in BSCCO. A thin gold layer was employed between BSCCO and Nb/AlOx/Nb to avoid interdiffusion of oxygen in BSCCO. We measured the current-voltage properties of the Nb/AlOx/Nb junctions in a liquid helium bath, and observed clear periodic step structures. A characteristic frequency corresponding to the voltage spacing of the steps was 63 GHz, which agreed with the Josephson plasma frequency of BSCCO. The result indicates that the Josephson plasma in BSCCO can interact with the ac Josephson current of the closely coupled Nb/AlOx/Nb Josephson junctions.",

keywords = "BiSrCaCuO, Josephson junction, Josephson plasma, Nb/AlO/Nb, Resonance",

author = "Y. Yamada and Y. Uematsu and Y. Mizugaki and Koji Nakajima and T. Yamashita",

year = "2001",

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doi = "10.1016/S0921-4534(01)00679-7",

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journal = "Physica C: Superconductivity and its Applications",

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TY - JOUR

T1 - Josephson plasma in Bi2Sr2CaCu2O8+δ detected by Nb/AlOx/Nb junction

AU - Yamada, Y.

AU - Uematsu, Y.

AU - Mizugaki, Y.

AU - Nakajima, Koji

AU - Yamashita, T.

PY - 2001/9/1

Y1 - 2001/9/1

N2 - We fabricated Nb/AlOx/Nb Josephson junctions on Bi2Sr2CaCu2O8+δ (BSCCO) single crystals to detect the Josephson plasma in BSCCO. A thin gold layer was employed between BSCCO and Nb/AlOx/Nb to avoid interdiffusion of oxygen in BSCCO. We measured the current-voltage properties of the Nb/AlOx/Nb junctions in a liquid helium bath, and observed clear periodic step structures. A characteristic frequency corresponding to the voltage spacing of the steps was 63 GHz, which agreed with the Josephson plasma frequency of BSCCO. The result indicates that the Josephson plasma in BSCCO can interact with the ac Josephson current of the closely coupled Nb/AlOx/Nb Josephson junctions.

AB - We fabricated Nb/AlOx/Nb Josephson junctions on Bi2Sr2CaCu2O8+δ (BSCCO) single crystals to detect the Josephson plasma in BSCCO. A thin gold layer was employed between BSCCO and Nb/AlOx/Nb to avoid interdiffusion of oxygen in BSCCO. We measured the current-voltage properties of the Nb/AlOx/Nb junctions in a liquid helium bath, and observed clear periodic step structures. A characteristic frequency corresponding to the voltage spacing of the steps was 63 GHz, which agreed with the Josephson plasma frequency of BSCCO. The result indicates that the Josephson plasma in BSCCO can interact with the ac Josephson current of the closely coupled Nb/AlOx/Nb Josephson junctions.

KW - BiSrCaCuO

KW - Josephson junction

KW - Josephson plasma

KW - Nb/AlO/Nb

KW - Resonance

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