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RESEARCH PRODUCT

Fluxon dynamics in Li–Al codoped by microwave surface resistance measurements

Marco BonuraM. MonniM. Li VigniA. Agliolo Gallitto

subject

Materials scienceFluxonCondensed matter physicsEnergy Engineering and Power TechnologyField dependenceCondensed Matter PhysicsMagnetic hysteresisElectronic Optical and Magnetic MaterialsMagnetic fieldSurface conductivityHysteresisvisual_artLattice (order)visual_art.visual_art_mediumCeramicElectrical and Electronic Engineering

description

Abstract The magnetic-field-induced variations of the microwave surface resistance, R s , have been investigated in ceramic Mg1−x(LiAl)xB2, with x in the range 0.1 – 0.4 . The measurements have been performed on increasing and decreasing the DC magnetic field, H 0 , at fixed temperatures. At low temperatures, we have observed a magnetic hysteresis in the R s ( H 0 ) curves in all the investigated samples. On increasing the temperature, the range of H 0 in which the hysteretic behavior is visible shrinks; however, in the sample with x = 0.1 it is present up to temperatures close to T c . We show that the field dependence of R s can be quantitatively justified taking into account the critical-state effects on the fluxon lattice only in the sample with x = 0.4 . On the contrary, in the samples with x 0.4 the hysteresis exhibits an unusual shape, similar to that observed in others two-gap MgB2 samples, which cannot be justified in the framework of the critical-state models.

yearjournalcountryeditionlanguage
2010-10-01Physica C: Superconductivity
https://doi.org/10.1016/j.physc.2010.02.029