Contact characteristics for bulk superconductors

Naoki Yamamoto; Takuya Imaizumi; Koichiro Sawa; Masaru Tomita; Masato Murakami; Izumi Hirabayashi

doi:10.1016/j.physc.2004.01.090

Contact characteristics for bulk superconductors

Naoki Yamamoto, Takuya Imaizumi, Koichiro Sawa, Masaru Tomita, Masato Murakami, Izumi Hirabayashi

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

6 Citations (Scopus)

Abstract

We have studied the contact characteristics of two resin-impregnated bulk superconductors in mechanical contact. In the previous work, it was confirmed that a switching phenomenon between high and low resistance range took place at a threshold current or a transfer current value in the V-I curves of YBCO contact. In this paper we found that the transfer current exceeded 30 A and the contact resistance were decreased to 40 μΩ at 77 K in the mechanical contact when the sample surfaces were carefully polished. Moreover we succeed in decreasing the contact resistance to 6 μΩ with depositing the metal on the contact surface. The present results suggest that a pair of superconducting blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems running in a persistent current mode.

Original language	English
Pages (from-to)	662-667
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	412-414
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2004.01.090
Publication status	Published - 2004 Oct

Keywords

Contact resistance
Metal deposition
Persistent current switch
Transfer current
YBCO

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/j.physc.2004.01.090

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title = "Contact characteristics for bulk superconductors",

abstract = "We have studied the contact characteristics of two resin-impregnated bulk superconductors in mechanical contact. In the previous work, it was confirmed that a switching phenomenon between high and low resistance range took place at a threshold current or a transfer current value in the V-I curves of YBCO contact. In this paper we found that the transfer current exceeded 30 A and the contact resistance were decreased to 40 μΩ at 77 K in the mechanical contact when the sample surfaces were carefully polished. Moreover we succeed in decreasing the contact resistance to 6 μΩ with depositing the metal on the contact surface. The present results suggest that a pair of superconducting blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems running in a persistent current mode.",

keywords = "Contact resistance, Metal deposition, Persistent current switch, Transfer current, YBCO",

author = "Naoki Yamamoto and Takuya Imaizumi and Koichiro Sawa and Masaru Tomita and Masato Murakami and Izumi Hirabayashi",

note = "Funding Information: This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for superconductivity Applications. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2004",

month = oct,

doi = "10.1016/j.physc.2004.01.090",

language = "English",

volume = "412-414",

pages = "662--667",

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

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T1 - Contact characteristics for bulk superconductors

AU - Yamamoto, Naoki

AU - Imaizumi, Takuya

AU - Sawa, Koichiro

AU - Tomita, Masaru

AU - Murakami, Masato

AU - Hirabayashi, Izumi

N1 - Funding Information: This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for superconductivity Applications. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2004/10

Y1 - 2004/10

N2 - We have studied the contact characteristics of two resin-impregnated bulk superconductors in mechanical contact. In the previous work, it was confirmed that a switching phenomenon between high and low resistance range took place at a threshold current or a transfer current value in the V-I curves of YBCO contact. In this paper we found that the transfer current exceeded 30 A and the contact resistance were decreased to 40 μΩ at 77 K in the mechanical contact when the sample surfaces were carefully polished. Moreover we succeed in decreasing the contact resistance to 6 μΩ with depositing the metal on the contact surface. The present results suggest that a pair of superconducting blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems running in a persistent current mode.

AB - We have studied the contact characteristics of two resin-impregnated bulk superconductors in mechanical contact. In the previous work, it was confirmed that a switching phenomenon between high and low resistance range took place at a threshold current or a transfer current value in the V-I curves of YBCO contact. In this paper we found that the transfer current exceeded 30 A and the contact resistance were decreased to 40 μΩ at 77 K in the mechanical contact when the sample surfaces were carefully polished. Moreover we succeed in decreasing the contact resistance to 6 μΩ with depositing the metal on the contact surface. The present results suggest that a pair of superconducting blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems running in a persistent current mode.

KW - Contact resistance

KW - Metal deposition

KW - Persistent current switch

KW - Transfer current

KW - YBCO

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JO - Physica C: Superconductivity and its applications

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IS - SPEC. ISS.

ER -

Contact characteristics for bulk superconductors

Abstract

Keywords

ASJC Scopus subject areas

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