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RESEARCH PRODUCT
Effects of Weak Links in the Nonlinear Microwave Response of MgB2 Superconductor
Giovanni GiunchiG. BonsignoreA. Agliolo GallittoM. Li Vignisubject
Superconductivitymicrowave responseCondensed Matter - Materials ScienceMaterials scienceCondensed matter physicsCondensed Matter - SuperconductivitySettore FIS/01 - Fisica SperimentaleMicrowave responseMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesMicrowave frequencyCondensed Matter Physicsweak links.SignalElectronic Optical and Magnetic MaterialsMagnetic fieldharmonic generationSuperconductivity (cond-mat.supr-con)Nonlinear systemmagnesium diboridevisual_artCondensed Matter::Superconductivityvisual_art.visual_art_mediumSample preparationCeramicdescription
We report experimental results of second-harmonic (SH) response at microwave frequency in several ceramic MgB2 samples, prepared by different methods. The SH signal has been investigated as a function of the temperature and DC magnetic field. The investigation has been carried out at low magnetic fields, where nonlinear processes arising from motion of Abrikosov fluxons are ineffective. We show that the low-temperature SH emission is ascribable to processes involving weak links. Comparison among the peculiarities of the SH signal radiated by the different samples shows that the presence of weak links strongly depends on the sample preparation method, as well as the purity and morphology of the components used for the preparation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-06-22 |