Nucleation of superconductivity in a mesoscopic loop of varying width

Abstract

We study the evolution of the superconducting state in a perforated disk by varying the size of the hole. The superconducting properties are investigated by means of transport measurements around the superconducting/normal phase boundary Tc(H). A transition from a one-dimensional to a two-dimensional regime is seen when increasing the magnetic field for disks with small holes. A good agreement is found between the measured Tc(H) line and the calculations performed in the framework of the linearized Ginzburg-Landau theory. The effect of breaking the axial symmetry of the structure by moving the hole away from the center of the disk is also studied. An enhanced critical field is found for the asymmetric structures, possibly due to the recovery of the singly connected state.

arXiv comment12 pages, 9 figures, accpeted for publication in Phys. Rev. B

References in corpus (13)

• Geometrical destruction of the global phase coherence in ultrathin superconducting cylinders
• Vortex states in superconducting rings
• Critical Fields of mesoscopic superconductors
• Multiple flux jumps and irreversible behavior of thin Al superconducting rings
• Dilation of the Giant Vortex State in a Mesoscopic Superconducting Loop
• Induction of dc voltage, proportional to the persistent current, by external ac current on system of inhomogeneous superconducting loops
• Dynamic transitions between metastable states in a superconducting ring
• Flux-Induced Vortex in Mesoscopic Superconducting Loops
• Strong enhancement of superconductivity in a nanosized Pb bridge
• Stationary phase slip state in quasi-one-dimensional rings
• Annular Vortex Solutions to the Landau-Ginzburg Equations in Mesoscopic Superconductors
• Flux transitions in a superconducting ring
• Surface superconducting states and paramagnetism in mesoscopic superconductors

Cited by in corpus (10)

• Large Magnetoresistance Oscillations in Mesoscopic Superconductors Due to Current-Excited Moving Vortices
• Little-Parks effect in single YBaCuO sub-micron rings
• Little-Parks oscillations with half-quantum fluxoid features in Sr2RuO4 micro rings
• Manipulating multi-vortex states in superconducting structures
• Imaging phase slip dynamics in micron-size superconducting rings
• Fluxoid fluctuations in mesoscopic superconducting rings
• Little-Parks oscillations near a persistent current loop
• Guiding structures with multiply connected cross-sections: evolution of propagation in external fields at complex Robin parameters
• Fluctuations in a mesoscopic superconducting ring: resonant behavior of conductivity and specific heat in two mode critical regime
• Finding the boson-number distributions in superconductors from photon spectra emitted by supercurrent-carrying rings irradiated with far IR fields