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声子软化对锡纳米结构超导临界温度的影响。

The influence of phonon softening on the superconducting critical temperature of Sn nanostructures.

作者信息

Houben Kelly, Jochum Johanna K, Couet Sebastien, Menéndez Enric, Picot Thomas, Hu Michael Y, Zhao Jiyong Y, Alp E Ercan, Vantomme André, Temst Kristiaan, Van Bael Margriet J

机构信息

Quantum Solid State Physics, Celestijnenlaan 200D, B-3001, Leuven, Belgium.

Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200 D, B-3001, Leuven, Belgium.

出版信息

Sci Rep. 2020 Mar 31;10(1):5729. doi: 10.1038/s41598-020-62617-4.

DOI:10.1038/s41598-020-62617-4
PMID:32235906
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7109077/
Abstract

The increase in superconducting transition temperature (T) 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 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 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.

摘要

研究了锡纳米结构与块体相比超导转变温度（T）的升高情况。分析了弱耦合超导体锡的声子态密度（PDOS）变化，并将其与通过磁力测量法测得的T升高相关联。与块体锡的PDOS相比，所有纳米结构样品的PDOS显示低能声子模式数量略有增加，高能声子模式数量大幅减少。先前使用核共振非弹性X射线散射确定的声子态密度，被用于使用艾伦 - 戴恩斯 - 麦克米兰（ADMM）形式来计算超导转变温度。计算得到的T值以及实验测定的T值均显示出相较于块体超导转变温度有所升高。这些值之间的良好一致性表明，声子软化对锡纳米结构的超导转变温度有重大影响。在这些体系中，电子限制效应的影响似乎较小。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/01ae79cbac83/41598_2020_62617_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/66201d090f40/41598_2020_62617_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/6bda705f3f15/41598_2020_62617_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/0f5a093f5a18/41598_2020_62617_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/4148474bf1c4/41598_2020_62617_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/0e33f0ddeea3/41598_2020_62617_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/be2673c1bde1/41598_2020_62617_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/01ae79cbac83/41598_2020_62617_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/66201d090f40/41598_2020_62617_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/6bda705f3f15/41598_2020_62617_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/0f5a093f5a18/41598_2020_62617_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/4148474bf1c4/41598_2020_62617_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/0e33f0ddeea3/41598_2020_62617_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/be2673c1bde1/41598_2020_62617_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2eb3/7109077/01ae79cbac83/41598_2020_62617_Fig7_HTML.jpg

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