Superconducting properties of high-Jc MgB2 coatings

D. K. Christen, C. Cantoni, J. R. Thompson, M. Paranthaman, M. F. Chisholm, H. R. Kerchner, H. M. Christen

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

We report the fabrication and superconducting properties of ∼0.5 μm thick, fine-grained polycrystalline coatings of MgB2 on single-crystal substrate surfaces. The films exhibit large critical current densities, implying little effect from the grain boundaries. Analyses for thermal activation effects are inconclusive, and evidence is presented that the irreversibility line is dominated by the combined influences of Hc2 anisotropy and polycrystallinity. Comparative studies of the magnetic persistent currents and electrical transport properties reveal excellent agreement over a wide range of temperature and magnetic field. This result is contrary to similar comparisons on high-temperature cuprates, where disparities arise from the effects of large flux creep and the diverse electric field regimes probed by the two techniques. The MgB2 films exhibit extremely sharp voltage-current relations away from the irreversibility line, in qualitative agreement with observed large Jc values and low rates of magnetic flux creep.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalMaterials Research Society Symposium - Proceedings
Volume689
StatePublished - 2002
EventMaterials for High-Temperature Superconductor Technologies - Boston, MA, United States
Duration: Nov 26 2001Nov 29 2001

Fingerprint

Dive into the research topics of 'Superconducting properties of high-Jc MgB2 coatings'. Together they form a unique fingerprint.

Cite this