Microwave properties of superconducting MgB2

Measurements of 10 GHz microwave surface resistance, Rs, of dense MgB2 wire and pellet are reported. Significant improvements are observed in the wire with reduction of porosity. The data lie substantially above the theoretical estimates for a pure Bardeen–Cooper–Schrieffer s-wave superconductor. Ho...

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Bibliographic Details
Published in:Applied physics letters 2001-06, Vol.78 (26), p.4160-4162
Main Authors: Hakim, N., Parimi, P. V., Kusko, C., Sridhar, S., Canfield, P. C., Bud’ko, S. L., Finnemore, D. K.
Format: Article
Language:English
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Summary:Measurements of 10 GHz microwave surface resistance, Rs, of dense MgB2 wire and pellet are reported. Significant improvements are observed in the wire with reduction of porosity. The data lie substantially above the theoretical estimates for a pure Bardeen–Cooper–Schrieffer s-wave superconductor. However, the Rs (20 K) of the wire is an order of magnitude lower than that of polycrystal YBa2Cu3O6.95 and matches with single-crystal YBa2Cu3O6.95. The results show promise for the use of MgB2 in microwave applications.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1379366