Enhancement of superconductivity in Magnesium Diboride nano-structures
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Abstract
For many years scientists have tried different strategies to improve superconductivity. The recent development in the growth of thin films and grains at the nanoscale has allowed to measure in certain materials critical temperatures that differ from the bulk values. At the same time these results have motivated theoretical studies that try to reproduce them using first-principles calculations and different theories about superconductivity.
We aim to contribute in this area with an analytical study of MgB
Another motivation to carry out this research is that in recent experiments they have managed to grow MgB
MgB
The most relevant results of this research are: for an infinite thin film with a thickness of less than 10 nm the critical temperature ”oscillates” between
It is important to mention that due to the limitations of the theory used and the simplifications made: neglecting quantum fluctuations, defects, the influence of substrate, etc. our results must not be taken fully quantitative, specially for thicknesses smaller 4 nm. Yet, we believe they grasp most of the relevant physical phenomena of the described nano-scale system.