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MgB2 nonlinear properties investigated under localized high rf magnetic field excitation-report 2 | | Tamin Tai
; B. G. Ghamsari
; T. Tan
; C. G. Zhuang
; X. X. Xi
; Steven M. Anlage
; | | Date: |
6 Sep 2013 | | Abstract: | The high transition temperature and low surface resistance of MgB2 attracts
interest in its potential application in superconducting radio frequency
accelerating cavities. However, compared to traditional Nb cavities, the
viability of MgB2 at high rf fields is still open to question. Our approach is
to study the nonlinear electrodynamics of the material under localized rf
magnetic fields. Because of the presence of the small superconducting gap in
the ?band, the nonlinear response of MgB2 at low temperature is potentially
complicated compared to a single-gap s-wave superconductor such as Nb.
Understanding the mechanisms of nonlinearity coming from the two-band structure
of MgB2, as well as extrinsic sources of nonlinearity, is an urgent
requirement. A localized and strong rf magnetic field, created by a magnetic
write head, is integrated into our nonlinear-Meissner-effect scanning microwave
microscope [Tamin Tai, X. X. Xi, C. G. Zhuang, D. I. Mircea, and S. M. Anlage,
IEEE Trans. Appl. Supercond. 21, 2615 (2011)]. MgB2 films with thickness 50 nm,
fabricated by a hybrid physical-chemical vapor deposition technique on
dielectric substrates, are measured at a fixed location and show a strongly
temperature-dependent third harmonic response. We propose that several possible
mechanisms are responsible for this nonlinear response. | | Source: | arXiv, 1309.1706 | | Services: | Forum | Review | PDF | Favorites | |
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