Enhanced vortex pinning by a composite antidot lattice in a superconducting Pb film
arXiv:cond-mat/0412102 · doi:10.1103/PhysRevB.72.014507
Abstract
The use of artificial defects is known to enhance the superconducting critical parameters of thin films. In the case of conventional superconductors, regular arrays of submicron holes (antidots) substantially increase the critical temperature Tc(H) and critical current Ic(H) for all fields. Using electrical transport measurements, we study the effect of placing an additional small antidot in the unit cell of the array. This composite antidot lattice consists of two interpenetrating antidot square arrays with a different antidot size and the same lattice period. The smaller antidots are located exactly at the centers of the cells of the array of large antidots. We show that the composite antidot lattice can trap a higher number of flux quanta per unit cell inside the antidots, compared to a reference antidot film without the additional small antidots in the center of the cells. As a consequence, the field range in which an enhanced critical current is observed is considerably expanded. Finally, the possible stable vortex lattice patterns at several matching fields are determined by molecular dynamics simulations.
References in corpus (3)
Cited by in corpus (19)
- Vortex configurations and critical parameters in superconducting thin films containing antidot arrays: Nonlinear Ginzburg-Landau theory
- Realization of Artificial Ice Systems for Magnetic Vortices in a Superconducting MoGe Thin-film with Patterned Nanostructures
- Enhancing the Critical Current of a Superconducting Film in a Wide Range of Magnetic Fields with a Conformal Array of Nanoscale Holes
- Enhanced pinning and proliferation of matching effects in a superconducting film with a Penrose array of magnetic dots
- Superconducting films with antidot arrays - novel behavior of the critical current
- Effect of hexagonal patterned arrays and defect geometry on the critical current of superconducting films
- Pinning, Ordering, and Dynamics of Vortices in Conformal Crystal and Gradient Pinning Arrays
- Enhancing superconducting critical current by randomness
- A two-coil mutual inductance technique to study matching effect in disordered NbN thin films
- New scaling laws for pinning force density in superconductors
- Dynamic transition from Mott-like to metal-like state of the vortex lattice in a superconducting film with a periodic array of holes
- Evidence of fractional matching states in nanoperforated Nb thin film grown on porous silicon
- Microwave Microscope Studies of Trapped Vortex Dynamics in Superconductors
- The phase boundary of superconducting niobium thin films with antidot arrays fabricated with microsphere photolithography
- Influence of pinning centers of different natures onsurrounding vortices
- Origin of Matching Effect in Anti-dot Array of Superconducting NbN Thin Films
- Vortex kinks in superconducting films with periodically modulated thickness
- Vortex States in Archimedean Tiling Pinning Arrays
- Abnormal magnetoresistance behavior in Nb thin film with rectangular antidot lattice