Universal Dependence of the Critical Temperature in HTS on the Fractional Volume of Nanosize Defects

Gandini, A.; Weinstein, R.; Sawh, Ravi‐Persad; Mayes, B.; Parks, D.

doi:10.1109/tasc.2007.898251

Cited by 3 publications

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our initial assumption was that the reduced damage of MILD pinning, e.g., vs CCPC, was the sole cause of the dramatic increase in J c . We reported this analysis, as well as the data, in four papers at two conferences [16,17,18].…”

Section: Summary Of the Most Important Resultsmentioning

confidence: 99%

Improved Pinning Morphology in HTS with Order of Magnitude Increase in Jc and Pinned Field

Mayes¹,

Weinstein²

2008

View full text Add to dashboard Cite

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information.Send comments regarding this burden estimate or any other aspect of this collection of information, including suggesstions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA, 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any oenalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. a. REPORTImproved pinning morphology in HTS with order of magnitude increase in Jc and pinned field.14. ABSTRACT SECURITY CLASSIFICATION OF:In 2004 most scientists working to increase Jc in HTS believed that continuous columnar pinning centers (CCPCs) were ideal. This was based upon elegant ionic radiation studies yielding increased Jc. Our contrary evidence augered for performing an experiment comparing Jc for a wide range of pinning center (PC) continuities and diameters (including CCPCs) produced by high energy ions. (Increased discontinuity correlated with lower diameter.) Multiple-in-line-damage (MILD) PCs had not been systematically studied before this. Results showed an increase in Jc by a factor of 17, for discontinuity near 67%, with PC diameter ~ 6.8 nm and fluence of 10*12/cm*2. Analysis, assuming that the Jc enhancement was caused by the over 10-fold Improved pinning morphology in HTS with order of magnitude increase in Jc and pinned field. Report Title ABSTRACTIn 2004 most scientists working to increase Jc in HTS believed that continuous columnar pinning centers (CCPCs) were ideal. This was based upon elegant ionic radiation studies yielding increased Jc. Our contrary evidence augered for performing an experiment comparing Jc for a wide range of pinning center (PC) continuities and diameters (including CCPCs) produced by high energy ions. (Increased discontinuity correlated with lower diameter.) Multiple-in-line-damage (MILD) PCs had not been systematically studied before this.Results showed an increase in Jc by a factor of 17, for discontinuity near 67%, with PC diameter ~ 6.8 nm and fluence of 10*12/cm*2. Analysis, assuming that the Jc enhancement was caused by the over 10-fold decrease in MILD PC/ CCPC damage, matched the data well except for a Jc "fishtail" effect, and Jc increase vs. fluence. Analysis of the discontinuities showed they enhanced vortex wandering, and produced entanglement which increased at higher fields, resulting in a fishtail. Wandering vortices jump from gaps in ion tracks to adjacent continuous tracks, diminishing pinning losses. At higher fluence, closer tracks leave less unpinned vortex length. Thus, dis...

show abstract

Section: Summary Of the Most Important Resultsmentioning

confidence: 99%