| Improved Pinning Center Morphology in HTS with Order-of-Magnitude Increase in J_c and B_pin Compared to Columnar Pinning |
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| 作者姓名： | R.Weinstein A.Gandini R.Sawh D.Parks |
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| 作者单位： | Beam Particle Dynamics Laboratory，Physics Department，and Texas Center for Superconductivity and Advanced Materials，University of Houston，Houston，Texas 77204-5005，USA，Beam Particle Dynamics Laboratory，Physics Department，and Texas Center for Superconductivity and Advanced Materials，University of Houston，Houston，Texas 77204-5005，USA，Beam Particle Dynamics Laboratory，Physics Department，and Texas Center for Superconductivity and Advanced Materials，University of Houston，Houston，Texas 77204-5005，USA，Beam Particle Dynamics Laboratory，Physics Department，and Texas Center for Superconductivity and Advanced Materials，University of Houston，Houston，Texas 77204-5005，USA |
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| 基金项目： | US Army Research Office,the Welch Foundation(No.E-1380),，Texas Center of Superconductivity and Advanced Materials |
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| 摘 要： | The motivation for continuous columnar pinning centers has been to provide maximum Upin. It has been assumed that this provides the best Jc and Bpin. Limitations on Jc and Spin observed for columnar pinning have been attributed to degradation of the order parameter and Tc. We examine columnar pinning by ionic damage and conclude instead that geometrical effects of columnar pinning on percolation path and on the number of pinning centers are the dominant limitations of columnar pinning, leading to a limit of Bpin- 4 T. Evidence suggests that multiple-in-line-defects (MILD) are far better suited to increase Jc and Bpin. The morphology of MILD pinning is reviewed. Ion energy loss per unit distance, Se, is found to be most promising in a regime almost diametrically opposite to that sought to maximize Upin. We expect Jc - 106 A/cm2 and Bpin > 40T from MILD pinning, despite sharply decreased Upin. Experimental confirmation is proposed.
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Improved Pinning Center Morphology in HTS withOrder-of-Magnitude Increase in Jc and BpinCompared to Columnar Pinning |
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| R.Weinstein,A.Gandini,R.Sawh,D.Parks.Improved Pinning Center Morphology in HTS with Order-of-Magnitude Increase in J_c and B_pin Compared to Columnar Pinning[J].Tsinghua Science and Technology,2003(3). |
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| Authors: | R Weinstein A Gandini R Sawh D Parks
Beam Particle Dynamics Laboratory Physics |
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| Institution: | R. Weinstein,A. Gandini,R. Sawh,D. Parks
Beam Particle Dynamics Laboratory,Physics Department,and Texas Center for Superconductivity and Advanced Materials,University of Houston,Houston,Texas 77204-5005,USA |
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| Abstract: | The motivation for continuous columnar pinning centers has been to provide maximum Upin. It has been assumed that this provides the best Jc and Bpin. Limitations on Jc and Spin observed for columnar pinning have been attributed to degradation of the order parameter and Tc. We examine columnar pinning by ionic damage and conclude instead that geometrical effects of columnar pinning on percolation path and on the number of pinning centers are the dominant limitations of columnar pinning, leading to a limit of Bpin- 4 T. Evidence suggests that multiple-in-line-defects (MILD) are far better suited to increase Jc and Bpin. The morphology of MILD pinning is reviewed. Ion energy loss per unit distance, Se, is found to be most promising in a regime almost diametrically opposite to that sought to maximize Upin. We expect Jc - 106 A/cm2 and Bpin > 40T from MILD pinning, despite sharply decreased Upin. Experimental confirmation is proposed. |
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| Keywords: | improved pinning high critical current high field pinning ionic pinning centers columnar pinning limits |
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