Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure
Struts of a superconducting YBa<sub>2</sub>Cu<sub>3</sub>O<sub><i>y</i></sub> (YBCO) foam prepared by the infiltration growth method on the base of commercial polyurethane foams were extracted from the bulk, and thoroughly characterized concerning the...
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MDPI AG
2024-04-01
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| author | Yassine Slimani Essia Hannachi Anjela Koblischka-Veneva Michael Rudolf Koblischka |
| author_facet | Yassine Slimani Essia Hannachi Anjela Koblischka-Veneva Michael Rudolf Koblischka |
| author_sort | Yassine Slimani |
| collection | DOAJ |
| description | Struts of a superconducting YBa<sub>2</sub>Cu<sub>3</sub>O<sub><i>y</i></sub> (YBCO) foam prepared by the infiltration growth method on the base of commercial polyurethane foams were extracted from the bulk, and thoroughly characterized concerning the microstructure and the magnetoresistance, measured by the four-point technique. Optical microscopy, electron microscopy, electron backscatter diffraction and atomic force microscopy observations indicate a unique microstructure of the foam struts which shows a large amount of tiny Y<sub>2</sub>BaCuO<sub>5</sub> (Y-211) particles (with diameters between 50 and 100 nm) being enclosed in channel-like grain boundaries between the YBCO grains and a one-of-a-kind surface of the struts covered with Ba<sub>3</sub>Cu<sub>5</sub>O<sub><i>y</i></sub>-particles. The resistance data obtained at temperatures in the range 4.2 K <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>≤</mo><mi>T</mi><mo>≤</mo></mrow></semantics></math></inline-formula> 150 K (applied magnetic fields ranging from 0 to 7 T) were analyzed in the framework of the fluctuation-induced conductivity (FIC) approach using the models of Aslamazov–Larkin (AL) and Lawrence–Doniach (LD). The resulting FIC curves reveal the presence of five distinct fluctuation regimes, namely, the short-wave (SWF), one-dimensional (1D), two-dimensional (2D), three-dimensional (3D), and critical (CR) fluctuation domains. The analysis of the FIC data enable the coherence length in the direction of the <i>c</i>-axis at zero-temperature (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ξ</mi><mi>c</mi></msub><mrow><mo>(</mo><mn>0</mn><mo>)</mo></mrow></mrow></semantics></math></inline-formula>), the irreversibility field (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>B</mi><mi>irr</mi></msub></semantics></math></inline-formula>), the upper critical magnetic field (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>B</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></semantics></math></inline-formula>), the critical current density at <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><mo>=</mo></mrow></semantics></math></inline-formula> 0 K (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>J</mi><mi>c</mi></msub><mrow><mo>(</mo><mn>0</mn><mo>)</mo></mrow></mrow></semantics></math></inline-formula>) and several other parameters describing the the material’s superconducting properties to be determined. The present data reveal that the minuscule Y-211 particles found along the YBCO grain boundaries alter the excess conductivity and the fluctuation behavior as compared to conventional YBCO samples, leading to a quite high value for <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>J</mi><mi>c</mi></msub><mrow><mo>(</mo><mn>0</mn><mo>)</mo></mrow></mrow></semantics></math></inline-formula> for a sample with a non-optimized pinning landscape. |
| first_indexed | 2024-04-24T10:40:30Z |
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| spelling | doaj.art-c780469c4b0d452c9a407f19b21191cb2024-04-12T13:22:13ZengMDPI AGMaterials1996-19442024-04-01177164910.3390/ma17071649Excess Conductivity Analysis of an YBCO Foam Strut and Its MicrostructureYassine Slimani0Essia Hannachi1Anjela Koblischka-Veneva2Michael Rudolf Koblischka3Department of Biophysics, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi ArabiaFaculty of Sciences of Bizerte, University of Carthage, Zarzouna 7021, TunisiaExperimental Physics, Saarland University, P.O. Box 151150, D-66041 Saarbrücken, GermanyExperimental Physics, Saarland University, P.O. Box 151150, D-66041 Saarbrücken, GermanyStruts of a superconducting YBa<sub>2</sub>Cu<sub>3</sub>O<sub><i>y</i></sub> (YBCO) foam prepared by the infiltration growth method on the base of commercial polyurethane foams were extracted from the bulk, and thoroughly characterized concerning the microstructure and the magnetoresistance, measured by the four-point technique. Optical microscopy, electron microscopy, electron backscatter diffraction and atomic force microscopy observations indicate a unique microstructure of the foam struts which shows a large amount of tiny Y<sub>2</sub>BaCuO<sub>5</sub> (Y-211) particles (with diameters between 50 and 100 nm) being enclosed in channel-like grain boundaries between the YBCO grains and a one-of-a-kind surface of the struts covered with Ba<sub>3</sub>Cu<sub>5</sub>O<sub><i>y</i></sub>-particles. The resistance data obtained at temperatures in the range 4.2 K <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>≤</mo><mi>T</mi><mo>≤</mo></mrow></semantics></math></inline-formula> 150 K (applied magnetic fields ranging from 0 to 7 T) were analyzed in the framework of the fluctuation-induced conductivity (FIC) approach using the models of Aslamazov–Larkin (AL) and Lawrence–Doniach (LD). The resulting FIC curves reveal the presence of five distinct fluctuation regimes, namely, the short-wave (SWF), one-dimensional (1D), two-dimensional (2D), three-dimensional (3D), and critical (CR) fluctuation domains. The analysis of the FIC data enable the coherence length in the direction of the <i>c</i>-axis at zero-temperature (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ξ</mi><mi>c</mi></msub><mrow><mo>(</mo><mn>0</mn><mo>)</mo></mrow></mrow></semantics></math></inline-formula>), the irreversibility field (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>B</mi><mi>irr</mi></msub></semantics></math></inline-formula>), the upper critical magnetic field (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>B</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></semantics></math></inline-formula>), the critical current density at <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>T</mi><mo>=</mo></mrow></semantics></math></inline-formula> 0 K (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>J</mi><mi>c</mi></msub><mrow><mo>(</mo><mn>0</mn><mo>)</mo></mrow></mrow></semantics></math></inline-formula>) and several other parameters describing the the material’s superconducting properties to be determined. The present data reveal that the minuscule Y-211 particles found along the YBCO grain boundaries alter the excess conductivity and the fluctuation behavior as compared to conventional YBCO samples, leading to a quite high value for <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>J</mi><mi>c</mi></msub><mrow><mo>(</mo><mn>0</mn><mo>)</mo></mrow></mrow></semantics></math></inline-formula> for a sample with a non-optimized pinning landscape.https://www.mdpi.com/1996-1944/17/7/1649YBCOfoammicrostructureresistanceexcess conductivityfluctuations |
| spellingShingle | Yassine Slimani Essia Hannachi Anjela Koblischka-Veneva Michael Rudolf Koblischka Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure Materials YBCO foam microstructure resistance excess conductivity fluctuations |
| title | Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure |
| title_full | Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure |
| title_fullStr | Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure |
| title_full_unstemmed | Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure |
| title_short | Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure |
| title_sort | excess conductivity analysis of an ybco foam strut and its microstructure |
| topic | YBCO foam microstructure resistance excess conductivity fluctuations |
| url | https://www.mdpi.com/1996-1944/17/7/1649 |
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