6533b851fe1ef96bd12a8d2e
RESEARCH PRODUCT
Reentrant stability of superconducting films and the vanishing of dendritic flux instability
Kartik SenapatiR. C. BudhaniD. V. ShantsevM. R. NevalaIlari MaasiltaTom H. JohansenV. V. Yurchenkosubject
SuperconductivityPhysicsReentrancyCondensed matter physicsField (physics)Condensed Matter::SuperconductivityFluxThermal stabilityThermomagnetic convectionCondensed Matter PhysicsInstabilityElectronic Optical and Magnetic MaterialsMagnetic fielddescription
We propose a mechanism responsible for the abrupt vanishing of the dendritic flux instability found in many superconducting films when an increasing magnetic field is applied. The onset of flux avalanches and the subsequent reentrance of stability in NbN films were investigated using magneto-optical imaging, and the threshold fields were measured as functions of critical current density ${j}_{c}$. The results are explained with excellent quantitative agreement by a thermomagnetic model published recently [D. V. Denisov et al., Phys. Rev. B 73, 014512 (2006)], showing that the reentrant stability is a direct consequence of a monotonously decreasing ${j}_{c}$ versus field.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-09-26 | Physical Review B |