Effects of disorder on the microwave properties of MgB2 polycrystalline films

Item Type: Article
MIUR type: Article > Journal article
Title: Effects of disorder on the microwave properties of MgB2 polycrystalline films
Authors string: G. Ghigo; Ummarino G.A.; R. Gerbaldo; L. Gozzelino; F. Laviano; E. Mezzetti
University authors:
Journal or Publication Title: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Referee type: Not specified type
Volume: 74
Page Range: 184518-1-184518-6
Number of Pages: 6
ISSN: 1098-0121
Abstract: The role of disorder in superconducting magnesium diboride MgB2 policrystalline films is investigated in the high frequency range by a coplanar microwave resonator technique. Two sources of disorder are considered, heavy-ion irradiation damage and sample ageing. Microwave measurements are analyzed in the framework of the two-gap model with strong interband scattering contribution. It turns out that disorder enhancement increases the interband scattering rate, resulting in a reduction of the surface resistance at low temperatures, due to a slight increase of the gap. Moreover, increasing disorder at grain boundaries induces a nonmonotonic residual surface resistance, showing the features of a resistive behavior for the highest disorder level. Finally, the effects of the different kinds of disorder on the intrinsic and on the grain-boundary properties of the MgB2 films are compared and discussed
Date: 2006
Status: Published
Language of publication: English
Uncontrolled Keywords:
Departments (original): DIFIS - Physics
Departments: DISAT - Department of Applied Science and Technology
Related URLs:
    Subjects: Area 02 - Scienze fisiche > FISICA DELLA MATERIA
    Area 02 - Scienze fisiche > FISICA SPERIMENTALE
    Date Deposited: 28 Dec 2006 17:12
    Last Modified: 24 Oct 2014 10:27
    Id Number (DOI): 10.1103/PhysRevB.74.184518
    Permalink: http://porto.polito.it/id/eprint/1433183
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