Fluxon dynamics in Li–Al codoped MgB2 by microwave surface resistance measurements

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1 Citazioni (Scopus)

Abstract

The magnetic-field-induced variations of the microwave surface resistance, Rs, have been investigated in ceramic Mg_(1-x)(LiAl)_xB_2, with x in the range 0.1 - 0.4. The measurements have been performed on increasing and decreasing the DC magnetic field, H0, at fixed temperatures. At low temperatures, we have observed a magnetic hysteresis in the Rs(H0) curves in all the investigated samples. On increasing the temperature, the range of H0 in which the hysteretic behavior is visible shrinks; however, in the sample with x=0.1 it is present up to temperatures close to Tc. We show that the field dependence of Rs 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 MgB_2 samples, which cannot be justified in the framework of the critical-state models.
Lingua originaleEnglish
pagine (da-a)907-910
Numero di pagine4
RivistaPHYSICA. C, SUPERCONDUCTIVITY
Volume470
Stato di pubblicazionePublished - 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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