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RESEARCH PRODUCT
Origin of the fast magnetization relaxation at low temperatures in HTS with strong pinning
T. HorideDana MiuMasashi MukaidaI. IvanShigeru HoriiPaolo MeleYutaka YoshidaPetre BadicaL. MiuGerhard JakobKaname MatsumotoAtaru Ichinosesubject
SuperconductivityMaterials scienceFlux pinningCondensed matter physicsRelaxation (NMR)Energy Engineering and Power TechnologyCondensed Matter PhysicsInstabilityElectronic Optical and Magnetic MaterialsVortexMagnetizationCreepCondensed Matter::SuperconductivityElectrical and Electronic EngineeringPinning forcedescription
The temperature T variation of the normalized magnetization relaxation rate S in high-temperature superconductors (HTS) with strong vortex pinning exhibits a maximum in the low-T range. This was reported for various HTS, and the origin of the faster relaxation at low T appearing in standard magnetization relaxation measurements was usually related to specific pinning properties of the investigated specimens. Since the observed behaviour seems to be characteristic to all HTS with enhanced pinning (generated by random and/or correlated disorder), we show that the S(T) maximum can be explained in terms of classic collective vortex creep. The influence of thermo-magnetic instabilities in the low-T range is also evidenced. The collective (elastic) creep regime is generated by the T dependent macroscopic currents induced in the sample during standard magnetization measurements.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-11-01 | Physica C: Superconductivity and its Applications |