Characteristic features of the temperature dependence of the surface impedance in polycrystalline MgB$_2$ samples

Details Characteristic features of the temperature dependence of the surface impedance in polycrystalline MgB$_2$ samples Characteristic features of the temperature dependence of the surface impedance in polycrystalline MgB$_2$ samples

2001-07-03

arxiv.org/abs/cond-mat/0107057v2

Physics

Condensed Matter

Superconductivity

7 pages, 3 figures. Europhysics Letters, accepted for publication

Scientific paper

10.1209/epl/i2002-00656-8

The real $R_s(T)$ and imaginary $X_s(T)$ parts of the surface impedance $Z_s(T)=R_s(T)+iX_s(T)$ in polycrystalline MgB$_2$ samples of different density with the critical temperature $T_c\approx 38$ K are measured at the frequency of 9.4 GHz and in the temperature range $5\le T<200$ K. The normal skin-effect condition $R_s(T)=X_s(T)$ at $T\ge T_c$ holds only for the samples of the highest density with roughness sizes not more than 0.1 $\mu$m. For such samples extrapolation $T\to 0$ of the linear at $T

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