6533b884fe1ef96bd12e091f
RESEARCH PRODUCT
Controllable morphology of flux avalanches in microstructured superconductors
M. MottaF. ColautoJ.i. VestgardenJ. FritzscheM. TimmermansJ. CuppensC. AttanasioC. CirilloV.v. MoshchalkovJ. Van De VondelT.h. JohansenW.a. OrtizAlejandro Silhaneksubject
nanostructured superconductorsPhysical chemical mathematical & earth Sciencesthermomagnetic instabilitiesPhysiqueCondensed Matter::SuperconductivityPhysicsPhysique chimie mathématiques & sciences de la terreflux avalanchesdescription
The morphology of abrupt bursts of magnetic flux into superconducting films with engineered periodic pinning centers (antidots) has been investigated. Guided flux avalanches of thermomagnetic origin develop a tree-like structure, with the main trunk perpendicular to the borders of the sample, while secondary branches follow well-defi ned directions determined by the geometrical details of the underlying periodic pinning landscape. Strikingly, we demonstrate that in a superconductor with relatively weak random pinning, the morphology of such flux avalanches can be fully controlled by proper combinations of lattice symmetry and antidot geometry. Moreover, the resulting flux patterns can be reproduced, to the fi nest details, by simulations based on a phenomenological thermomagnetic model. In turn, this model can be used to predict such complex structures and to estimate physical variables of more di fficult experimental access, such as the local values of temperature and electric fi eld.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-01 |