Measurements of Surface Impedance in MgB<sub>2</sub> in DC Magnetic Fields: Insights in Flux-Flow Resistivity
We present the multifrequency measurements of the surface resistance of spark-plasma-sintered MgB<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub>...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/1/205 |
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| author | Andrea Alimenti Kostiantyn Torokhtii Pablo Vidal García Enrico Silva Mihai Alexandru Grigoroscuta Petre Badica Adrian Crisan Nicola Pompeo |
| author_facet | Andrea Alimenti Kostiantyn Torokhtii Pablo Vidal García Enrico Silva Mihai Alexandru Grigoroscuta Petre Badica Adrian Crisan Nicola Pompeo |
| author_sort | Andrea Alimenti |
| collection | DOAJ |
| description | We present the multifrequency measurements of the surface resistance of spark-plasma-sintered MgB<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> performed through a dielectric loaded resonator operating at 16.5 and 26.7 GHz. By normally applying magnetic fields ≤1.2 T to the sample surface, we drove it in the mixed state. By means of data-rooted analysis, we found that the sample vortex dynamics could be fully described within a single-component approach. Pinning phenomena were present and characterized by a depinning frequency smaller than the measurement ones. The multiband nature of the superconductor emerged in the flux-flow resistivity, whose field dependence could be interpreted well within theoretical models. By exploiting them, the upper critical field was extracted in the low-temperature range, which exhibited a consistent temperature trend with the values obtained at the onset of the resistive transition near <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>T</mi><mi>c</mi></msub></semantics></math></inline-formula>, and was well in line with literature data on other polycrystalline samples. |
| first_indexed | 2024-03-11T09:56:30Z |
| format | Article |
| id | doaj.art-fc074423e5824c52915efeff1663386c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T09:56:30Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-fc074423e5824c52915efeff1663386c2023-11-16T15:48:29ZengMDPI AGMaterials1996-19442022-12-0116120510.3390/ma16010205Measurements of Surface Impedance in MgB<sub>2</sub> in DC Magnetic Fields: Insights in Flux-Flow ResistivityAndrea Alimenti0Kostiantyn Torokhtii1Pablo Vidal García2Enrico Silva3Mihai Alexandru Grigoroscuta4Petre Badica5Adrian Crisan6Nicola Pompeo7Dipartimento di Ingegneria Industriale, Elettronica e Meccanica, Università degli Studi Roma Tre, Via Vito Volterra 62, 00146 Roma, ItalyDipartimento di Ingegneria Industriale, Elettronica e Meccanica, Università degli Studi Roma Tre, Via Vito Volterra 62, 00146 Roma, ItalyDipartimento di Ingegneria Industriale, Elettronica e Meccanica, Università degli Studi Roma Tre, Via Vito Volterra 62, 00146 Roma, ItalyDipartimento di Ingegneria Industriale, Elettronica e Meccanica, Università degli Studi Roma Tre, Via Vito Volterra 62, 00146 Roma, ItalyNational Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, RomaniaNational Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, RomaniaNational Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, RomaniaDipartimento di Ingegneria Industriale, Elettronica e Meccanica, Università degli Studi Roma Tre, Via Vito Volterra 62, 00146 Roma, ItalyWe present the multifrequency measurements of the surface resistance of spark-plasma-sintered MgB<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> performed through a dielectric loaded resonator operating at 16.5 and 26.7 GHz. By normally applying magnetic fields ≤1.2 T to the sample surface, we drove it in the mixed state. By means of data-rooted analysis, we found that the sample vortex dynamics could be fully described within a single-component approach. Pinning phenomena were present and characterized by a depinning frequency smaller than the measurement ones. The multiband nature of the superconductor emerged in the flux-flow resistivity, whose field dependence could be interpreted well within theoretical models. By exploiting them, the upper critical field was extracted in the low-temperature range, which exhibited a consistent temperature trend with the values obtained at the onset of the resistive transition near <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>T</mi><mi>c</mi></msub></semantics></math></inline-formula>, and was well in line with literature data on other polycrystalline samples.https://www.mdpi.com/1996-1944/16/1/205MgB2microwavesmicrowave measurementssuperconductorssurface impedancevortex motion |
| spellingShingle | Andrea Alimenti Kostiantyn Torokhtii Pablo Vidal García Enrico Silva Mihai Alexandru Grigoroscuta Petre Badica Adrian Crisan Nicola Pompeo Measurements of Surface Impedance in MgB<sub>2</sub> in DC Magnetic Fields: Insights in Flux-Flow Resistivity Materials MgB2 microwaves microwave measurements superconductors surface impedance vortex motion |
| title | Measurements of Surface Impedance in MgB<sub>2</sub> in DC Magnetic Fields: Insights in Flux-Flow Resistivity |
| title_full | Measurements of Surface Impedance in MgB<sub>2</sub> in DC Magnetic Fields: Insights in Flux-Flow Resistivity |
| title_fullStr | Measurements of Surface Impedance in MgB<sub>2</sub> in DC Magnetic Fields: Insights in Flux-Flow Resistivity |
| title_full_unstemmed | Measurements of Surface Impedance in MgB<sub>2</sub> in DC Magnetic Fields: Insights in Flux-Flow Resistivity |
| title_short | Measurements of Surface Impedance in MgB<sub>2</sub> in DC Magnetic Fields: Insights in Flux-Flow Resistivity |
| title_sort | measurements of surface impedance in mgb sub 2 sub in dc magnetic fields insights in flux flow resistivity |
| topic | MgB2 microwaves microwave measurements superconductors surface impedance vortex motion |
| url | https://www.mdpi.com/1996-1944/16/1/205 |
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