A fundamental behavior on mechanical contacts of YBCO bulks

Koichiro Sawa, Masako Suzuki, Masaru Tomita, Masato Murakami

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A persistent current switch (PCS) is a key component for superconducting magnetic energy storage (SMES) system. In past research on a mechanical PCS, a metallic superconductor made of Nb and NbTi is used as a switching material. However, recently the research on SMES coil of a high temperature superconductor (HTS) is widely carried out, in which a PCS is also expected to work in liquid nitrogen temperature. In this paper, yttrium barium copper oxide (YBCO) bulk of HTS was proposed as a switch material, and the test on the fundamental characteristics of a mechanical contact between two YBCO bulks was carried out. As a result, a switching phenomenon between low and high resistance ranges was observed at a threshold current value in the V-I characteristics of the YBCO contact. Furthermore, the tests indicate that a certain amount of current needs to flow before the switching phenomenon. Because the discontinuous transition occurred after the surface-insulating layer formed by degradation of YBCO was destroyed due to current effect in the contact area.

Original languageEnglish
Pages (from-to)803-808
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - 2002 Oct 1
Externally publishedYes

Fingerprint

Yttrium barium copper oxides
barium oxides
copper oxides
yttrium
Switches
switches
High temperature superconductors
magnetic energy storage
Energy storage
high temperature superconductors
Liquid nitrogen
Superconducting materials
low resistance
high resistance
threshold currents
liquid nitrogen
Degradation
coils
degradation

Keywords

  • Mechanical contact
  • Persistent current switch
  • Superconducting magnetic energy storage
  • YBCO

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

A fundamental behavior on mechanical contacts of YBCO bulks. / Sawa, Koichiro; Suzuki, Masako; Tomita, Masaru; Murakami, Masato.

In: Physica C: Superconductivity and its Applications, Vol. 378-381, No. PART 1, 01.10.2002, p. 803-808.

Research output: Contribution to journalArticle

Sawa, Koichiro ; Suzuki, Masako ; Tomita, Masaru ; Murakami, Masato. / A fundamental behavior on mechanical contacts of YBCO bulks. In: Physica C: Superconductivity and its Applications. 2002 ; Vol. 378-381, No. PART 1. pp. 803-808.
@article{c1d4223accd741c08285e07e69658511,
title = "A fundamental behavior on mechanical contacts of YBCO bulks",
abstract = "A persistent current switch (PCS) is a key component for superconducting magnetic energy storage (SMES) system. In past research on a mechanical PCS, a metallic superconductor made of Nb and NbTi is used as a switching material. However, recently the research on SMES coil of a high temperature superconductor (HTS) is widely carried out, in which a PCS is also expected to work in liquid nitrogen temperature. In this paper, yttrium barium copper oxide (YBCO) bulk of HTS was proposed as a switch material, and the test on the fundamental characteristics of a mechanical contact between two YBCO bulks was carried out. As a result, a switching phenomenon between low and high resistance ranges was observed at a threshold current value in the V-I characteristics of the YBCO contact. Furthermore, the tests indicate that a certain amount of current needs to flow before the switching phenomenon. Because the discontinuous transition occurred after the surface-insulating layer formed by degradation of YBCO was destroyed due to current effect in the contact area.",
keywords = "Mechanical contact, Persistent current switch, Superconducting magnetic energy storage, YBCO",
author = "Koichiro Sawa and Masako Suzuki and Masaru Tomita and Masato Murakami",
year = "2002",
month = "10",
day = "1",
doi = "10.1016/S0921-4534(02)01547-2",
language = "English",
volume = "378-381",
pages = "803--808",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "PART 1",

}

TY - JOUR

T1 - A fundamental behavior on mechanical contacts of YBCO bulks

AU - Sawa, Koichiro

AU - Suzuki, Masako

AU - Tomita, Masaru

AU - Murakami, Masato

PY - 2002/10/1

Y1 - 2002/10/1

N2 - A persistent current switch (PCS) is a key component for superconducting magnetic energy storage (SMES) system. In past research on a mechanical PCS, a metallic superconductor made of Nb and NbTi is used as a switching material. However, recently the research on SMES coil of a high temperature superconductor (HTS) is widely carried out, in which a PCS is also expected to work in liquid nitrogen temperature. In this paper, yttrium barium copper oxide (YBCO) bulk of HTS was proposed as a switch material, and the test on the fundamental characteristics of a mechanical contact between two YBCO bulks was carried out. As a result, a switching phenomenon between low and high resistance ranges was observed at a threshold current value in the V-I characteristics of the YBCO contact. Furthermore, the tests indicate that a certain amount of current needs to flow before the switching phenomenon. Because the discontinuous transition occurred after the surface-insulating layer formed by degradation of YBCO was destroyed due to current effect in the contact area.

AB - A persistent current switch (PCS) is a key component for superconducting magnetic energy storage (SMES) system. In past research on a mechanical PCS, a metallic superconductor made of Nb and NbTi is used as a switching material. However, recently the research on SMES coil of a high temperature superconductor (HTS) is widely carried out, in which a PCS is also expected to work in liquid nitrogen temperature. In this paper, yttrium barium copper oxide (YBCO) bulk of HTS was proposed as a switch material, and the test on the fundamental characteristics of a mechanical contact between two YBCO bulks was carried out. As a result, a switching phenomenon between low and high resistance ranges was observed at a threshold current value in the V-I characteristics of the YBCO contact. Furthermore, the tests indicate that a certain amount of current needs to flow before the switching phenomenon. Because the discontinuous transition occurred after the surface-insulating layer formed by degradation of YBCO was destroyed due to current effect in the contact area.

KW - Mechanical contact

KW - Persistent current switch

KW - Superconducting magnetic energy storage

KW - YBCO

UR - http://www.scopus.com/inward/record.url?scp=4644373868&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4644373868&partnerID=8YFLogxK

U2 - 10.1016/S0921-4534(02)01547-2

DO - 10.1016/S0921-4534(02)01547-2

M3 - Article

AN - SCOPUS:4644373868

VL - 378-381

SP - 803

EP - 808

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - PART 1

ER -