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

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dc.creatorZhukov, A. A.
dc.creatorCohen, L. F.
dc.creatorPurnell, A.
dc.creatorBugoslavsky, Y.
dc.creatorBerenov, A.
dc.creatorMacManus-Driscoll, J. L.
dc.creatorZhai, H. Y
dc.creatorChristen, Hans M.
dc.creatorParanthaman, Mariappan P.
dc.creatorLowndes, Douglas H.
dc.creatorJo, M. A.
dc.creatorBlamire, M. C.
dc.creatorHao, Ling
dc.creatorGallop, J.
dc.date2001-07-11
dc.date2001-07-15
dc.date.accessioned2026-07-07T02:42:08Z
dc.date.available2026-07-07T02:42:08Z
dc.descriptionIn 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 $Δ/kT_c<1.76$ (film with $T_c=30$ K) and strong coupling behaviour with $Δ/kT_c\sim 2.25$ (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.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0107240
dc.identifierhttp://arxiv.org/abs/cond-mat/0107240
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/18015
dc.subjectSuperconductivity
dc.titleTemperature dependence of the microwave surface impedance measured on different kinds of MgB$_2$ samples
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