The role of a-axis grains in the transition to the normal state of YBa2Cu3O7−δ films and of 2G-coated conductors when induced by high electrical current densities
The influence of surface defects, in particular of a-axis grains, on the transition to the normal state induced by high current densities in YBa2Cu3O7−δ (YBCO) thin films and in a commercial 2G-coated conductor is investigated. For that purpose, the surface of the samples is observed by scanning ele...
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| Veröffentlicht in: | Journal of applied physics 2014-02, Vol.115 (5) |
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| container_title | Journal of applied physics |
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| creator | Bernstein, P. Ferro, G. Harnois, C. Mc Loughlin, C. Noudem, J. Osorio, M. R. Thimont, Y. Veira, J. A. Vidal, D. Vidal, F. |
| description | The influence of surface defects, in particular of a-axis grains, on the transition to the normal state induced by high current densities in YBa2Cu3O7−δ (YBCO) thin films and in a commercial 2G-coated conductor is investigated. For that purpose, the surface of the samples is observed by scanning electron microscopy and isothermal current-voltage curves are measured at different temperatures with pulsed currents up to the quenching value I*. The results show that the ratio of I* to the critical current is large if a-axis grains are not visible at the surface of the YBCO films, while it is much lower if the surface includes a-axis grains as this is the case for the coated conductor. The connection between the transition onset and the vortex dynamics, as well as the role of the a-axis grains in this process are discussed. The relation between the I* values obtained from thermal calculations and those resulting from vortex dynamics considerations is also discussed, as well as the possible consequences suggested by this work for the different applications of the coated conductors. |
| doi_str_mv | 10.1063/1.4864713 |
| format | Article |
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R. ; Thimont, Y. ; Veira, J. A. ; Vidal, D. ; Vidal, F.</creator><creatorcontrib>Bernstein, P. ; Ferro, G. ; Harnois, C. ; Mc Loughlin, C. ; Noudem, J. ; Osorio, M. R. ; Thimont, Y. ; Veira, J. A. ; Vidal, D. ; Vidal, F.</creatorcontrib><description>The influence of surface defects, in particular of a-axis grains, on the transition to the normal state induced by high current densities in YBa2Cu3O7−δ (YBCO) thin films and in a commercial 2G-coated conductor is investigated. For that purpose, the surface of the samples is observed by scanning electron microscopy and isothermal current-voltage curves are measured at different temperatures with pulsed currents up to the quenching value I*. The results show that the ratio of I* to the critical current is large if a-axis grains are not visible at the surface of the YBCO films, while it is much lower if the surface includes a-axis grains as this is the case for the coated conductor. The connection between the transition onset and the vortex dynamics, as well as the role of the a-axis grains in this process are discussed. The relation between the I* values obtained from thermal calculations and those resulting from vortex dynamics considerations is also discussed, as well as the possible consequences suggested by this work for the different applications of the coated conductors.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.4864713</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Applied physics ; Coating ; Condensed Matter ; Conductors ; Critical current (superconductivity) ; Current density ; Grains ; Materials Science ; Physics ; Scanning electron microscopy ; Surface defects ; Thin films ; YBCO superconductors</subject><ispartof>Journal of applied physics, 2014-02, Vol.115 (5)</ispartof><rights>2014 AIP Publishing LLC.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c256t-353d95cdeaa9a8820b34fcf019aaac4267c228da0458fba6471971167dd248f03</citedby><cites>FETCH-LOGICAL-c256t-353d95cdeaa9a8820b34fcf019aaac4267c228da0458fba6471971167dd248f03</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://hal.science/hal-02057550$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Bernstein, P.</creatorcontrib><creatorcontrib>Ferro, G.</creatorcontrib><creatorcontrib>Harnois, C.</creatorcontrib><creatorcontrib>Mc Loughlin, C.</creatorcontrib><creatorcontrib>Noudem, J.</creatorcontrib><creatorcontrib>Osorio, M. R.</creatorcontrib><creatorcontrib>Thimont, Y.</creatorcontrib><creatorcontrib>Veira, J. A.</creatorcontrib><creatorcontrib>Vidal, D.</creatorcontrib><creatorcontrib>Vidal, F.</creatorcontrib><title>The role of a-axis grains in the transition to the normal state of YBa2Cu3O7−δ films and of 2G-coated conductors when induced by high electrical current densities</title><title>Journal of applied physics</title><description>The influence of surface defects, in particular of a-axis grains, on the transition to the normal state induced by high current densities in YBa2Cu3O7−δ (YBCO) thin films and in a commercial 2G-coated conductor is investigated. For that purpose, the surface of the samples is observed by scanning electron microscopy and isothermal current-voltage curves are measured at different temperatures with pulsed currents up to the quenching value I*. The results show that the ratio of I* to the critical current is large if a-axis grains are not visible at the surface of the YBCO films, while it is much lower if the surface includes a-axis grains as this is the case for the coated conductor. The connection between the transition onset and the vortex dynamics, as well as the role of the a-axis grains in this process are discussed. The relation between the I* values obtained from thermal calculations and those resulting from vortex dynamics considerations is also discussed, as well as the possible consequences suggested by this work for the different applications of the coated conductors.</description><subject>Applied physics</subject><subject>Coating</subject><subject>Condensed Matter</subject><subject>Conductors</subject><subject>Critical current (superconductivity)</subject><subject>Current density</subject><subject>Grains</subject><subject>Materials Science</subject><subject>Physics</subject><subject>Scanning electron microscopy</subject><subject>Surface defects</subject><subject>Thin films</subject><subject>YBCO superconductors</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNpFkU1OHDEQha0okTIBFtzAEisWDf7pbruXMCKANBIbWGRl1dhu2qjHBtudhBtknTvkBjkHh-AkuAcEUklWvXr1lVWF0D4lR5S0_Jge1bKtBeWf0IIS2VWiachntCCE0Up2ovuKvqV0RwilkncL9O96sDiG0eLQY6jgt0v4NoLzCTuPcynmCD657EJJw1bxIW5gxClD3rb9OAW2nPiVeP7z9-k_7t24SRi8mWvsvNKh-AzWwZtJ5xAT_jVYX_AlLfr6EQ_udsB2tDpHpwtZTzFan7Gx28k27aIvPYzJ7r29O-jm-9n18qJaXZ1fLk9WlWZNmyvecNM12liADqRkZM3rXveEdgCga9YKzZg0QOpG9muY99QJSlthDKtlT_gOOnzlDjCq--g2EB9VAKcuTlZq1ggjzbzRn7R4D1699zE8TDZldRem6Mv3FKNMCFKCfhB1DClF279jKVHzxRRVbxfjL9Tjias</recordid><startdate>20140207</startdate><enddate>20140207</enddate><creator>Bernstein, P.</creator><creator>Ferro, G.</creator><creator>Harnois, C.</creator><creator>Mc Loughlin, C.</creator><creator>Noudem, J.</creator><creator>Osorio, M. 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R.</creatorcontrib><creatorcontrib>Thimont, Y.</creatorcontrib><creatorcontrib>Veira, J. A.</creatorcontrib><creatorcontrib>Vidal, D.</creatorcontrib><creatorcontrib>Vidal, F.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bernstein, P.</au><au>Ferro, G.</au><au>Harnois, C.</au><au>Mc Loughlin, C.</au><au>Noudem, J.</au><au>Osorio, M. R.</au><au>Thimont, Y.</au><au>Veira, J. A.</au><au>Vidal, D.</au><au>Vidal, F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The role of a-axis grains in the transition to the normal state of YBa2Cu3O7−δ films and of 2G-coated conductors when induced by high electrical current densities</atitle><jtitle>Journal of applied physics</jtitle><date>2014-02-07</date><risdate>2014</risdate><volume>115</volume><issue>5</issue><issn>0021-8979</issn><eissn>1089-7550</eissn><abstract>The influence of surface defects, in particular of a-axis grains, on the transition to the normal state induced by high current densities in YBa2Cu3O7−δ (YBCO) thin films and in a commercial 2G-coated conductor is investigated. For that purpose, the surface of the samples is observed by scanning electron microscopy and isothermal current-voltage curves are measured at different temperatures with pulsed currents up to the quenching value I*. The results show that the ratio of I* to the critical current is large if a-axis grains are not visible at the surface of the YBCO films, while it is much lower if the surface includes a-axis grains as this is the case for the coated conductor. The connection between the transition onset and the vortex dynamics, as well as the role of the a-axis grains in this process are discussed. The relation between the I* values obtained from thermal calculations and those resulting from vortex dynamics considerations is also discussed, as well as the possible consequences suggested by this work for the different applications of the coated conductors.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4864713</doi><oa>free_for_read</oa></addata></record> |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Applied physics Coating Condensed Matter Conductors Critical current (superconductivity) Current density Grains Materials Science Physics Scanning electron microscopy Surface defects Thin films YBCO superconductors |
| title | The role of a-axis grains in the transition to the normal state of YBa2Cu3O7−δ films and of 2G-coated conductors when induced by high electrical current densities |
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