Residual and intrinsic surface resistance ofYBa2Cu3O7−δ
| العنوان: | Residual and intrinsic surface resistance ofYBa2Cu3O7−δ |
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| المؤلفون: | Herman J. Fink |
| المصدر: | Physical Review B. 58:9415-9420 |
| بيانات النشر: | American Physical Society (APS), 1998. |
| سنة النشر: | 1998 |
| مصطلحات موضوعية: | Superconductivity, Physics, symbols.namesake, Residual resistivity, Condensed matter physics, Electrical resistivity and conductivity, Scattering rate, Transition temperature, symbols, Quasiparticle, Absolute zero, Debye model |
| الوصف: | A simple model is proposed which describes correctly the essential traits of the microwave surface resistance ${R}_{s}$ of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ above and below the transition temperature ${T}_{c}.$ One of the key features is an electron scattering rate, which is the sum of a temperature- ($T$-) independent term and one that obeys the Gr\"uneisen $T$ dependence, and is carried over unchanged from the normal to the superconducting state. Furthermore, the $T$ dependence of the quasiparticles is related to the empirical penetration depth, $\ensuremath{\lambda}(T).$ We find that ${R}_{s}(T)$ depends linearly on $T$ at low temperatures, which is a consequence of a predominantly constant elastic electron scattering rate and a linear $T$ dependent $[\ensuremath{\lambda}(T){]}^{\ensuremath{-}2}$ in the $\mathrm{ab}$ plane as $\stackrel{\ensuremath{\rightarrow}}{T}0\mathrm{K}.$ We confirm previous experiments indicating that a maximum and a minimum of ${R}_{s}(T)$ between absolute zero and ${T}_{c}$ is the signature of a clean specimen, corresponding to a small residual resistivity. Increasing the residual resistivity suppresses the peak of ${R}_{s}(T)$ and lowers the surface resistance. The real part of the conductivity ${\ensuremath{\sigma}}^{\ensuremath{'}}$ of a relatively clean specimen shows a distinct peak below ${T}_{c}$ which is caused by the Gr\"uneisen $T$ dependent intrinsic resistivity, together with a gradual freezing out of the quasiparticles, and a remaining residual resistivity as $\stackrel{\ensuremath{\rightarrow}}{T}0\mathrm{K}.$ The slopes of ${R}_{s}(T)$ and of ${\ensuremath{\sigma}}^{\ensuremath{'}}(T)$ are discontinuous at ${T}_{c}.$ Increasing the frequency and/or the residual resistivity decreases the peak of ${\ensuremath{\sigma}}^{\ensuremath{'}}$ and shifts it to higher temperatures. The slope of ${R}_{s}^{2}(T)$ just above ${T}_{c}$ is linear and proportional to the Debye temperature. |
| تدمد: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.58.9415 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::e7c9076ab46b633d4a6cdcbce9cd2fec https://doi.org/10.1103/physrevb.58.9415 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........e7c9076ab46b633d4a6cdcbce9cd2fec |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10953795 01631829 |
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| DOI: | 10.1103/physrevb.58.9415 |