The influence of phonon softening on the superconducting critical temperature of Sn nanostructures
Abstract The increase in superconducting transition temperature (T C ) of Sn nanostructures in comparison to bulk, was studied. Changes in the phonon density of states (PDOS) of the weakly coupled superconductor Sn were analyzed and correlated with the increase in T C measured by magnetometry. The P...
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2020
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oai:doaj.org-article:5b2bf7ad194247a0ad3e47b2b4ebf19e2021-12-02T18:17:55ZThe influence of phonon softening on the superconducting critical temperature of Sn nanostructures10.1038/s41598-020-62617-42045-2322https://doaj.org/article/5b2bf7ad194247a0ad3e47b2b4ebf19e2020-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-62617-4https://doaj.org/toc/2045-2322Abstract The increase in superconducting transition temperature (T C ) of Sn nanostructures in comparison to bulk, was studied. Changes in the phonon density of states (PDOS) of the weakly coupled superconductor Sn were analyzed and correlated with the increase in T C measured by magnetometry. The PDOS of all nanostructured samples shows a slightly increased number of low-energy phonon modes and a strong decrease in the number of high-energy phonon modes in comparison to the bulk Sn PDOS. The phonon densities of states, which were determined previously using nuclear resonant inelastic X-ray scattering, were used to calculate the superconducting transition temperature using the Allen-Dynes-McMillan (ADMM) formalism. Both the calculated as well as the experimentally determined values of T C show an increase compared to the bulk superconducting transition temperature. The good agreement between these values indicates that phonon softening has a major influence on the superconducting transition temperature of Sn nanostructures. The influence of electron confinement effects appears to be minor in these systems.Kelly HoubenJohanna K. JochumSebastien CouetEnric MenéndezThomas PicotMichael Y. HuJiyong Y. ZhaoE. Ercan AlpAndré VantommeKristiaan TemstMargriet J. Van BaelNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020) |
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Medicine R Science Q Kelly Houben Johanna K. Jochum Sebastien Couet Enric Menéndez Thomas Picot Michael Y. Hu Jiyong Y. Zhao E. Ercan Alp André Vantomme Kristiaan Temst Margriet J. Van Bael The influence of phonon softening on the superconducting critical temperature of Sn nanostructures |
| description |
Abstract The increase in superconducting transition temperature (T C ) of Sn nanostructures in comparison to bulk, was studied. Changes in the phonon density of states (PDOS) of the weakly coupled superconductor Sn were analyzed and correlated with the increase in T C measured by magnetometry. The PDOS of all nanostructured samples shows a slightly increased number of low-energy phonon modes and a strong decrease in the number of high-energy phonon modes in comparison to the bulk Sn PDOS. The phonon densities of states, which were determined previously using nuclear resonant inelastic X-ray scattering, were used to calculate the superconducting transition temperature using the Allen-Dynes-McMillan (ADMM) formalism. Both the calculated as well as the experimentally determined values of T C show an increase compared to the bulk superconducting transition temperature. The good agreement between these values indicates that phonon softening has a major influence on the superconducting transition temperature of Sn nanostructures. The influence of electron confinement effects appears to be minor in these systems. |
| format |
article |
| author |
Kelly Houben Johanna K. Jochum Sebastien Couet Enric Menéndez Thomas Picot Michael Y. Hu Jiyong Y. Zhao E. Ercan Alp André Vantomme Kristiaan Temst Margriet J. Van Bael |
| author_facet |
Kelly Houben Johanna K. Jochum Sebastien Couet Enric Menéndez Thomas Picot Michael Y. Hu Jiyong Y. Zhao E. Ercan Alp André Vantomme Kristiaan Temst Margriet J. Van Bael |
| author_sort |
Kelly Houben |
| title |
The influence of phonon softening on the superconducting critical temperature of Sn nanostructures |
| title_short |
The influence of phonon softening on the superconducting critical temperature of Sn nanostructures |
| title_full |
The influence of phonon softening on the superconducting critical temperature of Sn nanostructures |
| title_fullStr |
The influence of phonon softening on the superconducting critical temperature of Sn nanostructures |
| title_full_unstemmed |
The influence of phonon softening on the superconducting critical temperature of Sn nanostructures |
| title_sort |
influence of phonon softening on the superconducting critical temperature of sn nanostructures |
| publisher |
Nature Portfolio |
| publishDate |
2020 |
| url |
https://doaj.org/article/5b2bf7ad194247a0ad3e47b2b4ebf19e |
| work_keys_str_mv |
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1718378275049308160 |