Nucleation of superconductivity in a mesoscopic loop of varying width

Mathieu Morelle; Dušan S. Golubović; Victor V. Moshchalkov

doi:10.1103/PhysRevB.70.144528

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Nucleation of superconductivity in a mesoscopic loop of varying width

Mathieu Morelle, Dušan S. Golubović, Victor V. Moshchalkov

DOI 10.1103/PhysRevB.70.144528 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown