Nucleation of superconductivity in mesoscopic star-shaped superconductors
D. A. Dikin (1), V. Chandrasekhar (1), V. R. Misko (2), V. M. Fomin, (2), J. T. Devreese (2) ((1) Department of Physics, Astronomy,, Northwestern University, (2) TFVS, Universiteit Antwerpen - UIA)
TL;DR
This study investigates how superconductivity nucleates in a mesoscopic star-shaped superconductor, revealing inhomogeneous transition behavior and boundary-enhanced superconductivity through experiments and simulations.
Contribution
It provides new insights into the inhomogeneous nucleation process and boundary effects in mesoscopic star-shaped superconductors, combining experimental and numerical approaches.
Findings
Inhomogeneous superconducting transition observed
Superconductivity is enhanced near boundaries
Rich structure in transition as a function of temperature and magnetic field
Abstract
We study the phase transition of a star-shaped superconductor, which covers smoothly the range from zero to two dimensions with respect to the superconducting coherence length. Detailed measurements and numerical calculations show that the nucleation of superconductivity in this device is very inhomogeneous, resulting in rich structure in the superconducting transition as a function of temperature and magnetic field. The superconducting order parameter is strongly enhanced and mostly robust in regions close to multiple boundaries.
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