Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe<sub>0.5</sub>Te<sub>0.5</sub>
The enhanced performance of superconducting FeSe<sub>0.5</sub>Te<sub>0.5</sub> materials with added micro-sized Pb and Sn particles is presented. A series of Pb- and Sn-added FeSe<sub>0.5</sub>Te<sub>0.5</sub> (FeSe<sub>0.5</sub>Te<sub&g...
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| author | Manasa Manasa Mohammad Azam Tatiana Zajarniuk Ryszard Diduszko Tomasz Cetner Andrzej Morawski Andrzej Wiśniewski Shiv J. Singh |
| author_facet | Manasa Manasa Mohammad Azam Tatiana Zajarniuk Ryszard Diduszko Tomasz Cetner Andrzej Morawski Andrzej Wiśniewski Shiv J. Singh |
| author_sort | Manasa Manasa |
| collection | DOAJ |
| description | The enhanced performance of superconducting FeSe<sub>0.5</sub>Te<sub>0.5</sub> materials with added micro-sized Pb and Sn particles is presented. A series of Pb- and Sn-added FeSe<sub>0.5</sub>Te<sub>0.5</sub> (FeSe<sub>0.5</sub>Te<sub>0.5</sub> + <i>x</i>Pb + <i>y</i>Sn; <i>x</i> = <i>y</i> = 0–0.1) bulks are fabricated by the solid-state reaction method and characterized through various measurements. A very small amount of Sn and Pb additions (<i>x</i> = <i>y</i> ≤ 0.02) enhance the transition temperature (<i>T</i><sub>c</sub><sup>onset</sup>) of pure FeSe<sub>0.5</sub>Te<sub>0.5</sub> by ~1 K, sharpening the superconducting transition and improving the metallic nature in the normal state, whereas larger metal additions (<i>x</i> = <i>y</i> ≥ 0.03) reduce <i>T</i><sub>c</sub><sup>onset</sup> by broadening the superconducting transition. Microstructural analysis and transport studies suggest that at <i>x = y</i> > 0.02, Pb and Sn additions enhance the impurity phases, reduce the coupling between grains, and suppress the superconducting percolation, leading to a broad transition. FeSe<sub>0.5</sub>Te<sub>0.5</sub> samples with 2 wt% of cometal additions show the best performance with their critical current density, <i>J</i><sub>c</sub>, and the pinning force, <i>F<sub>p</sub></i>, which might be attributable to providing effective flux pinning centres. Our study shows that the inclusion of a relatively small amount of Pb and Sn (<i>x</i> = <i>y</i> ≤ 0.02) works effectively for the enhancement of superconducting properties with an improvement of intergrain connections as well as better phase uniformity. |
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| institution | Directory Open Access Journal |
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| spelling | doaj.art-c658eb9b61fb4f6dbeb757ba43959b332023-11-17T17:06:41ZengMDPI AGMaterials1996-19442023-04-01167289210.3390/ma16072892Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe<sub>0.5</sub>Te<sub>0.5</sub>Manasa Manasa0Mohammad Azam1Tatiana Zajarniuk2Ryszard Diduszko3Tomasz Cetner4Andrzej Morawski5Andrzej Wiśniewski6Shiv J. Singh7Institute of High Pressure Physics (IHPP), Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, PolandInstitute of High Pressure Physics (IHPP), Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, PolandInstitute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, PolandInstitute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, PolandInstitute of High Pressure Physics (IHPP), Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, PolandInstitute of High Pressure Physics (IHPP), Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, PolandInstitute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, PolandInstitute of High Pressure Physics (IHPP), Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, PolandThe enhanced performance of superconducting FeSe<sub>0.5</sub>Te<sub>0.5</sub> materials with added micro-sized Pb and Sn particles is presented. A series of Pb- and Sn-added FeSe<sub>0.5</sub>Te<sub>0.5</sub> (FeSe<sub>0.5</sub>Te<sub>0.5</sub> + <i>x</i>Pb + <i>y</i>Sn; <i>x</i> = <i>y</i> = 0–0.1) bulks are fabricated by the solid-state reaction method and characterized through various measurements. A very small amount of Sn and Pb additions (<i>x</i> = <i>y</i> ≤ 0.02) enhance the transition temperature (<i>T</i><sub>c</sub><sup>onset</sup>) of pure FeSe<sub>0.5</sub>Te<sub>0.5</sub> by ~1 K, sharpening the superconducting transition and improving the metallic nature in the normal state, whereas larger metal additions (<i>x</i> = <i>y</i> ≥ 0.03) reduce <i>T</i><sub>c</sub><sup>onset</sup> by broadening the superconducting transition. Microstructural analysis and transport studies suggest that at <i>x = y</i> > 0.02, Pb and Sn additions enhance the impurity phases, reduce the coupling between grains, and suppress the superconducting percolation, leading to a broad transition. FeSe<sub>0.5</sub>Te<sub>0.5</sub> samples with 2 wt% of cometal additions show the best performance with their critical current density, <i>J</i><sub>c</sub>, and the pinning force, <i>F<sub>p</sub></i>, which might be attributable to providing effective flux pinning centres. Our study shows that the inclusion of a relatively small amount of Pb and Sn (<i>x</i> = <i>y</i> ≤ 0.02) works effectively for the enhancement of superconducting properties with an improvement of intergrain connections as well as better phase uniformity.https://www.mdpi.com/1996-1944/16/7/2892iron-based high-<i>T<sub>c</sub></i> superconductorscritical transition temperaturecritical current densitypinning forcetransport and magnetic measurements |
| spellingShingle | Manasa Manasa Mohammad Azam Tatiana Zajarniuk Ryszard Diduszko Tomasz Cetner Andrzej Morawski Andrzej Wiśniewski Shiv J. Singh Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe<sub>0.5</sub>Te<sub>0.5</sub> Materials iron-based high-<i>T<sub>c</sub></i> superconductors critical transition temperature critical current density pinning force transport and magnetic measurements |
| title | Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe<sub>0.5</sub>Te<sub>0.5</sub> |
| title_full | Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe<sub>0.5</sub>Te<sub>0.5</sub> |
| title_fullStr | Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe<sub>0.5</sub>Te<sub>0.5</sub> |
| title_full_unstemmed | Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe<sub>0.5</sub>Te<sub>0.5</sub> |
| title_short | Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe<sub>0.5</sub>Te<sub>0.5</sub> |
| title_sort | cometal addition effect on superconducting properties and granular behaviours of polycrystalline fese sub 0 5 sub te sub 0 5 sub |
| topic | iron-based high-<i>T<sub>c</sub></i> superconductors critical transition temperature critical current density pinning force transport and magnetic measurements |
| url | https://www.mdpi.com/1996-1944/16/7/2892 |
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