Temperature dependence of the microwave surface impedance measured on different kinds of MgB$_2$ samples

Details Temperature dependence of the microwave surface impedance measured on different kinds of MgB$_2$ samples Temperature dependence of the microwave surface impedance measured on different kinds of MgB$_2$ samples

2001-07-11

arxiv.org/abs/cond-mat/0107240v2

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

In this paper we present the results of measurements of the microwave surface impedance of a powder sample and two films of MgB$_2$. One film has $T_c=30$ K and is not textured, the other is partially c-axis orientated with $T_c=38$ K. These samples show different types of temperature dependence of the field penetration depth: linear for the powder sample, exponential with $\Delta/kT_c<1.76$ (film with $T_c=30$ K) and strong coupling behaviour with $\Delta/kT_c\sim 2.25$ (film with $T_c=38$ K). The results are well described in terms of an anisotropic gap model or presence of a slightly deficient MgB$_2$ phase. The data set for all samples - taken as a whole cannot be fitted into a two gap scenario.

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