On the determination of the quasiparticle scattering rate in unconventional superconductors by microwave surface impedance
As found from numerous microwave experiments on the unconventional Fe-based superconductors, the temperature dependence of the quasiparticle scattering rate t⁻¹ cannot be accurately described within the framework of standard Drude module in the popular approximation of wt << 1, where w is the...
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| Datum: | 2013 |
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| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2013
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| Schriftenreihe: | Физика низких температур |
| Schlagworte: | |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/118928 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | On the determination of the quasiparticle scattering rate in unconventional superconductors by microwave surface impedance / N.T. Cherpak, A.A. Barannik, R. Prozorov, M. Tanatar, A.V. Velichko // Физика низких температур. — 2013. — Т. 39, № 12. — С. 1423–1425. — Бібліогр.: 25 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | As found from numerous microwave experiments on the unconventional Fe-based superconductors, the temperature dependence of the quasiparticle scattering rate t⁻¹ cannot be accurately described within the framework of standard Drude module in the popular approximation of wt << 1, where w is the signal frequency. To account for the discrepancy, we have extended the classical Drude model for the case of arbitrary values of wt, and obtained the expression for t⁻¹ as a function of experimentally measurable quantities, namely the real and imaginary parts of the microwave surface impedance. We then show the temperature dependence of t⁻¹ in supercon-ducting Ba(Fe₁–xCox)₂As₂ single crystal pnictide derived from the Ka-band surface impedance measurements within the framework of the modified expression. The measurements indicate the extent to which assumption of wt << 1 gives results different from those obtained without this restriction, i.e., incorrect results. |
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