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Creating better superconductors by periodic nanopatterning
by Milan P. Allan, Mark H. Fischer, Oliver Ostojic, Arjo Andringa
- Published as SciPost Phys. 3, 010 (2017)
|As Contributors:||Milan Allan · Mark H Fischer|
|Submitted by:||Allan, Milan|
|Submitted to:||SciPost Physics|
|Subject area:||Condensed Matter Physics - Theory|
The quest to create superconductors with higher transition temperatures is as old as superconductivity itself. One strategy, popular after the realization that (conventional) superconductivity is mediated by phonons, is to chemically combine different elements within the crystalline unit cell to maximize the electron-phonon coupling. This led to the discovery of NbTi and Nb3Sn, to name just the most technologically relevant examples. Here, we propose a radically different approach to transform a `pristine' material into a better (meta-) superconductor by making use of modern fabrication techniques: designing and engineering the electronic properties of thin films via periodic patterning on the nanoscale. We present a model calculation to explore the key effects of different supercells that could be fabricated using nanofabrication or deliberate lattice mismatch, and demonstrate that specific pattern will enhance the coupling and the transition temperature. We also discuss how numerical methods could predict the correct design parameters to improve superconductivity in materials including Al, NbTi, and MgB2
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Published as SciPost Phys. 3, 010 (2017)
Submission & Refereeing History
Reports on this Submission
Anonymous Report 1 on 2017-5-14 Invited Report
- Cite as: Anonymous, Report on arXiv:1704.06805v1, delivered 2017-05-14, doi: 10.21468/SciPost.Report.138
new method to make better SC is proposed
just only method is proposed and no experimental evidence is given
In manuscript "Creating better superconductors by periodic nanopatterning",
the authors propose a new method to transform conventional 'pristine' superconductor to
better meta-superconductors with supercell periodicities of less or equal to 5 to 50 lattice
constant by modern nanofabrication. They show for the transformed meta-superconductor
how the photon-electron coupling parameter can be larger than one for 'pristine'
superconductors using BCS theory. Thus, the transformed meta-superconductor can have
higher critical temperature.
The manuscript is written clearly with in-depth discussion presented and all theoretical
calculations seems to be valid. I am convinced that this paper contains
rather definitive and quite reliable results on the subject. I recommend that
this manuscript should be published in SciPost Physics.