On the determination of the quasiparticle scattering rate in unconventional superconductors by microwave surface impedance
| Autor: | A. V. Velichko, Ruslan Prozorov, Makariy Tanatar, Alexander A. Barannik, Nickolay T. Cherpak |
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| Rok vydání: | 2013 |
| Předmět: |
Physics
Superconductivity High-temperature superconductivity Physics and Astronomy (miscellaneous) Condensed matter physics Краткие сообщения Condensed Matter - Superconductivity FOS: Physical sciences General Physics and Astronomy Drude model law.invention Superconductivity (cond-mat.supr-con) Surface conductivity law Condensed Matter::Superconductivity Scattering rate Quasiparticle Single crystal Microwave |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1090-6517 1063-777X |
| DOI: | 10.1063/1.4830422 |
| Popis: | In the approximation of validity of the Drude expression for quasiparticle conductivity and the assumption that all electrons at T = 0 transform into a superfluide condensate, the expression for the quasiparticle scattering rate tau -1 in terms of the real and imaginary parts of the microwave surface impedance has been obtained. The resulting expression is a generalization of the well-known expression for tau^-1, valid for omega x tau is much less 1, to an arbitrary value of omega x tau, where omega is the frequency of the microwave field. From experimental Ka-band impedance measurements, temperature dependence of tau^-1 in superconducting single crystal pnictides Ba(Fe1-xCox)2As2 is obtained using the generalized expression. It is shown that under condition of the given work, the approximation omega x tau is much less 1 gives the considerable error in determination of tau^-1. Comment: 3 pages, 1 figure |
| Databáze: | OpenAIRE |
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