Oslo Superconductivity Lab: Research

Research

Research activity of the Group is focused on various aspects of magnetic flux behavior in superconductors. It includes both experimental and theoretical studies.

Single-Vortex Magneto-Optics

Observation of vortices: (SuST-01) PDF, (RSI-03) PDF, Slides

Manipulating vortices with domain wall (APL-03): PDF, VIDEO

Vortex motion, avalanches, and annihilation: VIDEO, PDF

Vortex entry: VIDEO, PDF
and much more..........

Instabilities and flux turbulence

Flux Dendrites in MgB₂ films

Dendritic flux instability (EPL-02): PDF, VIDEO
Local threshold field for the instability (PRB-03): PDF
Interplay of dendritic avalanches and gradual penetration (SuST-03): PDF
Dendrites are created by a current pulse (APL-02): PDF
Suppression of dendrites by a thermal contact (Phys.C-01): PDF
Properties of the dendrites (SuST-01): PDF
and much more..........

Flux Dendrites in Nb₃Sn films (Cryo-03): PDF

Macroturbulence in HTS crystals

Theory for hydrodynamic instability of flux-antiflux interface (PRL-01): PDF
Turbulent flux relaxation in NdBaCuO and underdoped YBaCuO crystals (PRB-99): PDF, VIDEO
Turbulent flux relaxation in untwinned YBaCuO crystal (EPL-98): PDF
Instability of the critical state in NdBaCuO single crystals upon warming up (JLTP-99): PDF
and much more..........

Trapped-field magnets
- B- and T-distributions during pulsed-field magnetization (JAP-02): PDF

Vortex Avalanches

Review, Avalanches in Nb, in MgB2, in NbSe2

Mesoscopic superconductivity, Theory

T1 Relaxation in Josephson Charge Qubits (PRL-05): PDF

Coherent transfer of Cooper pairs by a movable grain: (Nature-01) PDF, (PRL-02) PDF

Quantum bit in dynamic disorder: PDF

Impurity-induced dephasing of Andreev states (PRB-01): PDF

Theory of thermoelectric phenomena in superconductors (PRB-02): PDF

Flux-pinning-induced stress and strain

Review, CSM and elastic theory calculations for superconductors of various shapes

Critical state theory for B-dependent Jc

Thin disk: Slides

Flux and current distrbution (PRB-99): PDF
Magnetization and ac susceptibility (PRB-00): PDF

Thin strip

Central peak in magnetization loop (PRL-99): PDF
Symmetry of flux distribution in the remanent state (PRB-00): PDF

Bulk superconductors
- Flux distrbution and magnetization for monotonous Jc(B) (JAP-95): PDF
- Flux distrbution and magnetization for Jc(B) with a secondary peak (PRB-97): PDF

Current-carrying superconductors

Theory and Simulations:

Scaling and exact solutions for the flux creep problem in a slab (PRB-02), PDF
Flux creep simulations for current-carrying strip: PDF, VIDEO

MO study of YBaCuO strips:

Relaxation of B and J distributions during the current pulse (SuST-02): PDF, Poster
B and J distributions during and after a current pulse (PRB-99): PDF, VIDEO
Burn-out under large transport current (APL-97): PDF

MO study of Bi-2223 tape:
- Global-scale and filament-scale distrbutions: PDF, Slides

Ferrite garnet films for magneto-optical imaging

Faraday rotation of bismuth-substituted ferrite garnet films: (PRB-02) PDF, (PRB-01) PDF

Interaction between a magnetic domain wall and vortices in a superconductor

Bulk superconductor (PRB-02): PDF
Thin film superconductor, Pearl vortex (PRB-02): PDF

Detection of magnetic data: (JAP-02): PDF

Magnetic levitation

A magnet levitating above a superconductor: VIDEO

Levitation Force from HTSC Thin-Film Disks (PRB-99): PDF

Lateral stability and magnetic stiffness in a high-Tc superconductor-magnet levitation system:
Theory (JAP-93): PDF
Experiment: JAP-94, PDF; APL-91: PDF

Levitation Force for the case of a cylindrical magnet (PhC-94): Word file