Switching response of MgB2 thin-film microwave resonators due to local nonlinear Joule heating

Item Type: Article
MIUR type: Article > Journal article
Title: Switching response of MgB2 thin-film microwave resonators due to local nonlinear Joule heating
Authors string: Ghigo G., Gerbaldo R., Gozzelino L., Laviano F., Mezzetti E.
University authors:
Journal or Publication Title: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Referee type: Not specified type
Volume: 82
Page Range: 054520-
Number of Pages: 7
ISSN: 1098-0121
Description/Info: We investigated the switching response of MgB2 coplanar waveguide resonators to increase of rf currents. A model based on the heat balance equation is able to account for the observed behaviors, including the presence of a thermal bistability regime. The model also reproduces the temperature dependence of the limiting currents. Results are consistent with the hypothesis that a hot spot is formed due to local Joule heating in correspondence with a weak link.Weak links are modeled as long S-N-S junctions, originating from the transition to the normal state of rows of MgB2 grains. This thermal process is proposed as the main mechanism setting the performance limit of polycrystalline MgB2 films in microwave applications
Date: 2010
Status: Published
Language of publication: English
Uncontrolled Keywords:
Departments (original): DIFIS - Physics
Departments: DENERG - Department of Energy
DISAT - Department of Applied Science and Technology
Related URLs:
    Subjects: Area 02 - Scienze fisiche > FISICA SPERIMENTALE
    Date Deposited: 01 Sep 2010 11:09
    Last Modified: 06 Oct 2012 08:23
    Id Number (DOI): 10.1103/PhysRevB.82.054520
    Permalink: http://porto.polito.it/id/eprint/2371975
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