Nucleation of superconductivity in mesoscopic star-shaped superconductors
Department of Physics and Astronomy, Northwestern University, Evanston, IL
2 Theoretische Fysica van de Vaste Stoffen, Universiteit Antwerpen (UIA), 2610 Antwerpen, Belgium
Corresponding author: a email@example.com
Published online: 4 August 2003
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: the superconducting order parameter is strongly enhanced and mostly robust in regions close to multiple boundaries. The strong inhomogeneity of the order parameter results in a rich structure of the superconducting transition as a function of temperature and magnetic field.
PACS: 74.78.-w – Superconducting films and low-dimensional structures / 74.78.Na – Mesoscopic and nanoscale systems / 74.20.De – Phenomenological theories
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003