Critical currents through strong links in Ag/BiSrCaCuO superconducting tapes
Transport critical currents were measured on Ag-sheathed Bi-based superconducting tapes at 77 K, with the field H parallel and perpendicular to the tape plane. A transition field from flux creep to flux flow regime of about 350 mT was obtained from the change of the curvature of the V- I characteris...
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| Veröffentlicht in: | Physica. C, Superconductivity Superconductivity, 1996-11, Vol.271 (1), p.51-58 |
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| creator | Horvat, J. Dou, S.X. Liu, H.K. Bhasale, R. |
| description | Transport critical currents were measured on Ag-sheathed Bi-based superconducting tapes at 77 K, with the field
H parallel and perpendicular to the tape plane. A transition field from flux creep to flux flow regime of about 350 mT was obtained from the change of the curvature of the
V-
I characteristics. The critical current conducted via strong links (
I
c
s) was extracted from the total
I
c. An empirical expression for
I
c
s versus
H in the flux creep regime was found:
I
c
s
= I
c0
s
exp[-(
H
H
0
)
a + 1],
with 0 ≤ a ≤ 1.
log(I
c
)
versus
H has a downward (negative) curvature in this regime, which is often mistakenly ascribed to the transition to flux flow. This curvature is defined by the values of
a and
H
0. In the flux flow regime,
I
c decreases with positive curvature. Using the measured values of
I
c0
s, we estimate
J
c would increase 2–3 orders of magnitude by turning all the weak links into strong ones. This shows there is still a great capacity for improvement of
J
c by still bettering the links between the grains. |
| doi_str_mv | 10.1016/S0921-4534(96)00039-1 |
| format | Article |
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H parallel and perpendicular to the tape plane. A transition field from flux creep to flux flow regime of about 350 mT was obtained from the change of the curvature of the
V-
I characteristics. The critical current conducted via strong links (
I
c
s) was extracted from the total
I
c. An empirical expression for
I
c
s versus
H in the flux creep regime was found:
I
c
s
= I
c0
s
exp[-(
H
H
0
)
a + 1],
with 0 ≤ a ≤ 1.
log(I
c
)
versus
H has a downward (negative) curvature in this regime, which is often mistakenly ascribed to the transition to flux flow. This curvature is defined by the values of
a and
H
0. In the flux flow regime,
I
c decreases with positive curvature. Using the measured values of
I
c0
s, we estimate
J
c would increase 2–3 orders of magnitude by turning all the weak links into strong ones. This shows there is still a great capacity for improvement of
J
c by still bettering the links between the grains.</description><identifier>ISSN: 0921-4534</identifier><identifier>EISSN: 1873-2143</identifier><identifier>DOI: 10.1016/S0921-4534(96)00039-1</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Critical density ; Flux creep ; Grain boundaries ; Weak links</subject><ispartof>Physica. C, Superconductivity, 1996-11, Vol.271 (1), p.51-58</ispartof><rights>1996</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c338t-9b258bed1d14e519268631edf6cf96bf3541b70bb1dc59fd78552a9c5e267f753</citedby><cites>FETCH-LOGICAL-c338t-9b258bed1d14e519268631edf6cf96bf3541b70bb1dc59fd78552a9c5e267f753</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0921453496000391$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Horvat, J.</creatorcontrib><creatorcontrib>Dou, S.X.</creatorcontrib><creatorcontrib>Liu, H.K.</creatorcontrib><creatorcontrib>Bhasale, R.</creatorcontrib><title>Critical currents through strong links in Ag/BiSrCaCuO superconducting tapes</title><title>Physica. C, Superconductivity</title><description>Transport critical currents were measured on Ag-sheathed Bi-based superconducting tapes at 77 K, with the field
H parallel and perpendicular to the tape plane. A transition field from flux creep to flux flow regime of about 350 mT was obtained from the change of the curvature of the
V-
I characteristics. The critical current conducted via strong links (
I
c
s) was extracted from the total
I
c. An empirical expression for
I
c
s versus
H in the flux creep regime was found:
I
c
s
= I
c0
s
exp[-(
H
H
0
)
a + 1],
with 0 ≤ a ≤ 1.
log(I
c
)
versus
H has a downward (negative) curvature in this regime, which is often mistakenly ascribed to the transition to flux flow. This curvature is defined by the values of
a and
H
0. In the flux flow regime,
I
c decreases with positive curvature. Using the measured values of
I
c0
s, we estimate
J
c would increase 2–3 orders of magnitude by turning all the weak links into strong ones. This shows there is still a great capacity for improvement of
J
c by still bettering the links between the grains.</description><subject>Critical density</subject><subject>Flux creep</subject><subject>Grain boundaries</subject><subject>Weak links</subject><issn>0921-4534</issn><issn>1873-2143</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNqFkE1OwzAQhS0EEqVwBKSsECxCPXHsxCtUIv6kSl0UJHZW4kxaQ5oU20HiJFyFU3EGkhaxZfNm870nzUfIKdBLoCAmCyojCGPO4nMpLiilTIawR0aQJiyMIGb7ZPSHHJIj5156iIKEEXnOrPFG53WgO2ux8S7wK9t2y1XgvG2bZVCb5tUFpgmmy8m1-f78Wtg-snyIro954LoNWt02Zae96Rs-36A7JgdVXjs8-b1j8nR785jdh7P53UM2nYWasdSHsoh4WmAJJcTIQUYiFQywrISupCgqxmMoEloUUGouqzJJOY9yqTlGIqkSzsbkbLe7se1bh86rtXEa6zpvsO2cigREXKYDyHegtq1zFiu1sWad2w8FVA0e1dajGiQpKdTWo4K-d7XrYf_Fu0GrnDbYaCyNRe1V2Zp_Fn4AaK1_jA</recordid><startdate>19961101</startdate><enddate>19961101</enddate><creator>Horvat, J.</creator><creator>Dou, S.X.</creator><creator>Liu, H.K.</creator><creator>Bhasale, R.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>19961101</creationdate><title>Critical currents through strong links in Ag/BiSrCaCuO superconducting tapes</title><author>Horvat, J. ; Dou, S.X. ; Liu, H.K. ; Bhasale, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c338t-9b258bed1d14e519268631edf6cf96bf3541b70bb1dc59fd78552a9c5e267f753</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>Critical density</topic><topic>Flux creep</topic><topic>Grain boundaries</topic><topic>Weak links</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Horvat, J.</creatorcontrib><creatorcontrib>Dou, S.X.</creatorcontrib><creatorcontrib>Liu, H.K.</creatorcontrib><creatorcontrib>Bhasale, R.</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physica. C, Superconductivity</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Horvat, J.</au><au>Dou, S.X.</au><au>Liu, H.K.</au><au>Bhasale, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Critical currents through strong links in Ag/BiSrCaCuO superconducting tapes</atitle><jtitle>Physica. C, Superconductivity</jtitle><date>1996-11-01</date><risdate>1996</risdate><volume>271</volume><issue>1</issue><spage>51</spage><epage>58</epage><pages>51-58</pages><issn>0921-4534</issn><eissn>1873-2143</eissn><abstract>Transport critical currents were measured on Ag-sheathed Bi-based superconducting tapes at 77 K, with the field
H parallel and perpendicular to the tape plane. A transition field from flux creep to flux flow regime of about 350 mT was obtained from the change of the curvature of the
V-
I characteristics. The critical current conducted via strong links (
I
c
s) was extracted from the total
I
c. An empirical expression for
I
c
s versus
H in the flux creep regime was found:
I
c
s
= I
c0
s
exp[-(
H
H
0
)
a + 1],
with 0 ≤ a ≤ 1.
log(I
c
)
versus
H has a downward (negative) curvature in this regime, which is often mistakenly ascribed to the transition to flux flow. This curvature is defined by the values of
a and
H
0. In the flux flow regime,
I
c decreases with positive curvature. Using the measured values of
I
c0
s, we estimate
J
c would increase 2–3 orders of magnitude by turning all the weak links into strong ones. This shows there is still a great capacity for improvement of
J
c by still bettering the links between the grains.</abstract><pub>Elsevier B.V</pub><doi>10.1016/S0921-4534(96)00039-1</doi><tpages>8</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0921-4534 |
| ispartof | Physica. C, Superconductivity, 1996-11, Vol.271 (1), p.51-58 |
| issn | 0921-4534 1873-2143 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_26125985 |
| source | Elsevier ScienceDirect Journals |
| subjects | Critical density Flux creep Grain boundaries Weak links |
| title | Critical currents through strong links in Ag/BiSrCaCuO superconducting tapes |
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