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Probing transport mechanisms of BaFe2As2 superconducting films and grain boundary junctions by noise spectroscopy
- Source :
- Scientific Reports
- Publication Year :
- 2014
- Publisher :
- Nature Publishing Group, 2014.
-
Abstract
- An important step forward for the understanding of high-temperature superconductivity has been the discovery of iron-based superconductors. Among these compounds, iron pnictides could be used for high-field magnet applications, resulting more advantageous over conventional superconductors, due to a high upper critical field as well as its low anisotropy at low temperatures. However, the principal obstacle in fabricating high quality superconducting wires and tapes is given by grain boundaries. In order to study these effects, the dc transport and voltage-noise properties of Co-doped BaFe₂As₂ superconducting films with artificial grain boundary junctions have been investigated. A specific procedure allows the separation of the film noise from that of the junction. While the former shows a standard 1/f behaviour, the latter is characterized by an unconventional temperature-dependent multi-Lorentzian voltage-spectral density. Moreover, below the film superconducting critical temperature, a peculiar noise spectrum is found for the grain boundary junction. Possible theoretical interpretation of these phenomena is proposed.
- Subjects :
- Superconductivity
Multidisciplinary
Materials science
Condensed matter physics
Noise spectroscopy
Pnictides and chalcogenides
Grain and twin boundaries
Noise (electronics)
Characterization and analytical techniques
Article
Noise processes and phenomena
Superconducting properties and materials
Applied physics
Quality (physics)
Magnet
Condensed Matter::Superconductivity
Grain boundary
Anisotropy
Critical field
Subjects
Details
- Language :
- English
- ISSN :
- 20452322
- Database :
- OpenAIRE
- Journal :
- Scientific Reports
- Accession number :
- edsair.doi.dedup.....a80983cb950759bc745da6f1038c3cbc
- Full Text :
- https://doi.org/10.1038/srep06163