rf surface impedance of a two-band superconductor

Binping Xiao; C. E. Reece

doi:10.1103/PhysRevAccelBeams.22.053101

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rf surface impedance of a two-band superconductor

Binping Xiao, C. E. Reece

DOI 10.1103/PhysRevAccelBeams.22.053101 · Physical Review Accelerators and Beams

T1

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Abstract

In this paper, we extend the Mattis-Bardeen theory to obtain the surface impedance of a two-band superconductor, and apply it to magnesium diboride (MgB2) for radiofrequency (rf) superconductivity applications. The numerical results for MgB2 are in good agreement with the previously published experimental results. The surface impedance properties are clearly dominated by the smaller gap, significantly limiting utility in the 10-20 K regime that might otherwise have been attractive.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.27	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39.5	Pressure not reported	unknown