Intergrain Effects in the AC Susceptibilityof Polycrystalline LaFeAsO_{0.94}F_{0.06}

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17 Citazioni (Scopus)

Abstract

The AC susceptibility, chi, at zero DC magnetic field of a polycrystalline sample of LaFeAsO_{0.94}F_{0.06} (Tc ≈ 24 K) has been investigated as a function of the temperature, the amplitude of the AC magnetic field (in the range Hac = 0.003 Oe - 4 Oe) and the frequency (in the range f = 10 kHz - 100 kHz). The chi(T) curve exhibits the typical two-step transition arising from the combined response of superconducting grains and intergranular weak-coupled medium. The intergranular part of chi strongly depends on both the amplitude and the frequency of the AC driving field, from few Kelvin below Tc down to T = 4.2 K. Our results show that, in the investigated sample, the intergrain critical current is not determined by pinning of Josephson vortices but by Josephson critical current across neighboring grains.
Lingua originaleEnglish
pagine (da-a)40-51
Numero di pagine12
RivistaJournal of Low Temperature Physics
Volume162
Stato di pubblicazionePublished - 2011

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • ???subjectarea.asjc.2500.2500???
  • Condensed Matter Physics

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