Contact resistance characteristics of high temperature superconducting bulk-II

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

Contact resistance characteristics of high temperature superconducting bulk-II

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

Research output: Contribution to journal › Conference article › peer-review

Abstract

We have studied the contact characteristics of two resin-impregnated Y-Ba-Cu-O (a composite of YBa₂Cu₃Oy and Y₂BaCuO₅+10wt%Ag₂O) bulk superconductors in mechanical contact. In the previous work, fundamental characteristics of mechanical contact between two YBCO bulks were studied. A switching phenomenon between high and low resistance range could be observed at a threshold current or a transfer current value in the V-I curves. In this paper we found that the transfer current exceeded 30A and the contact resistance decreased to 40 μΩ at 77K for the mechanical contact when the sample surfaces were carefully polished. Moreover we succeeded in decreasing the contact resistance to 6μΩ with depositing the metal on the contact surface. The present results suggest that a pair of YBCO blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems that are run in a persistent current mode.

Original language	English
Pages (from-to)	234-239
Number of pages	6
Journal	Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts
Publication status	Published - 2003 Oct 21
Externally published	Yes
Event	Electrical Contacts 20003 Proceedings of the 49th IEEE Holm Conference on Electrical Contacts - Washington, DC, United States Duration: 2003 Sep 8 → 2003 Sep 10

Keywords

Contact resistance
High-temperature superconductor
Persistent current switch
Transfer current
YBCO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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title = "Contact resistance characteristics of high temperature superconducting bulk-II",

abstract = "We have studied the contact characteristics of two resin-impregnated Y-Ba-Cu-O (a composite of YBa2Cu3Oy and Y2BaCuO5+10wt%Ag2O) bulk superconductors in mechanical contact. In the previous work, fundamental characteristics of mechanical contact between two YBCO bulks were studied. A switching phenomenon between high and low resistance range could be observed at a threshold current or a transfer current value in the V-I curves. In this paper we found that the transfer current exceeded 30A and the contact resistance decreased to 40 μΩ at 77K for the mechanical contact when the sample surfaces were carefully polished. Moreover we succeeded in decreasing the contact resistance to 6μΩ with depositing the metal on the contact surface. The present results suggest that a pair of YBCO blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems that are run in a persistent current mode.",

keywords = "Contact resistance, High-temperature superconductor, Persistent current switch, Transfer current, YBCO",

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

year = "2003",

month = oct,

day = "21",

language = "English",

pages = "234--239",

journal = "Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts",

issn = "0361-4395",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

note = "Electrical Contacts 20003 Proceedings of the 49th IEEE Holm Conference on Electrical Contacts ; Conference date: 08-09-2003 Through 10-09-2003",

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TY - JOUR

T1 - Contact resistance characteristics of high temperature superconducting bulk-II

AU - Yamamoto, Naoki

AU - Imaizumi, Takuya

AU - Sawa, Koichiro

AU - Tomita, Masaru

AU - Murakami, Masato

PY - 2003/10/21

Y1 - 2003/10/21

N2 - We have studied the contact characteristics of two resin-impregnated Y-Ba-Cu-O (a composite of YBa2Cu3Oy and Y2BaCuO5+10wt%Ag2O) bulk superconductors in mechanical contact. In the previous work, fundamental characteristics of mechanical contact between two YBCO bulks were studied. A switching phenomenon between high and low resistance range could be observed at a threshold current or a transfer current value in the V-I curves. In this paper we found that the transfer current exceeded 30A and the contact resistance decreased to 40 μΩ at 77K for the mechanical contact when the sample surfaces were carefully polished. Moreover we succeeded in decreasing the contact resistance to 6μΩ with depositing the metal on the contact surface. The present results suggest that a pair of YBCO blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems that are run in a persistent current mode.

AB - We have studied the contact characteristics of two resin-impregnated Y-Ba-Cu-O (a composite of YBa2Cu3Oy and Y2BaCuO5+10wt%Ag2O) bulk superconductors in mechanical contact. In the previous work, fundamental characteristics of mechanical contact between two YBCO bulks were studied. A switching phenomenon between high and low resistance range could be observed at a threshold current or a transfer current value in the V-I curves. In this paper we found that the transfer current exceeded 30A and the contact resistance decreased to 40 μΩ at 77K for the mechanical contact when the sample surfaces were carefully polished. Moreover we succeeded in decreasing the contact resistance to 6μΩ with depositing the metal on the contact surface. The present results suggest that a pair of YBCO blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems that are run in a persistent current mode.

KW - Contact resistance

KW - High-temperature superconductor

KW - Persistent current switch

KW - Transfer current

KW - YBCO

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M3 - Conference article

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SP - 234

EP - 239

JO - Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts

JF - Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts

SN - 0361-4395

T2 - Electrical Contacts 20003 Proceedings of the 49th IEEE Holm Conference on Electrical Contacts

Y2 - 8 September 2003 through 10 September 2003

ER -